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fail

Put it in another room?

1) change your fans to larger diameter lower rpm fans
2) use noise insulation on your case dynamat works good.

Ship it to me. ;p. Seriously though you want liquid cooling for quiet.

Build a wooden box around the computer with acoustic foam (the stuff with  egg shaped bumps and depressions in it) and baffles at the air intake and outlet to reduce the noise:

---------------------------------
In   |                  fan   |
|     |                    |     |
|     |                    |     |
|     |    computer   |     |
|     |                    |     |
|    fan                 |   out
---------------------------------

You will lose airflow going around the corners, but it will be quieter. You can also attach dryer vent hose and route the exhaust out a window.

Clean the fans

I have a similar setup, my miner is mounted on a wooden board and is very close to where I sleep in a small room.  I very much do not like noise and generally tolerate much less than others but I've finally gotten my system to a point where heat is more of a concern than noise.  Before obtaining this miner all of my computers were solid-state.  I only attached HDDs using a USB harddrive enclosure so I could switch them off when not using them.  I've not had experience running a fan in my room 24-7 for nearly 5 years (I used to have an ordinary computer tower, not particularly noisy, but running it 24-7 drove me mad so I got rid of it and replaced it with a solid-state computer).

You can find pictures of my rig here (http://forum.bitcoin.org/index.php?topic=7216.msg345510#msg345510).

I've attached Zalman VF3000A coolers to my Sapphire HD5850 Xtreme cards.  The coolers are designed for reference 58xx cards and my Xtreme cards are built much more like some of the 6xxx family so I had some difficulty mounting the coolers properly.  The fans on the coolers are 3-pin whereas the fans on the cards are 4-pin so I have to run the fans from the motherboard (if you want the cards to be able to control their fans then be aware of this if you decide to go down my route).  By using the enclosed Fanmates and turning them down to the minimum (which I think is about 50% fan speed) the coolers are pretty quiet (a fair bit quieter than most PSUs I'd say).

I replaced my 650W OCZ PSU with an 850W Scythe Couriki 2 PSU.  This isn't the most efficient or feature filled PSU but it's not bad and it's the best I know of for silence.  This power supply is a fair bit quieter than my two Zalman ZF3000A fans at minimum speed so if your PSU is giving you trouble then I recommend this.  3 5870s should be no bother for it (My 2x5850 system is currently drawing 304W at the wall).

The CPU fan is actually a little quieter than the PSU because it's running at minimum speed (It is rare that CPU usage exceeds 5% so the fan is never asked to go faster).  However, if I manually turn this fan up to full speed it completely drowns out the rest of the system so make sure these fans are at minimum speed.

I'm using a HDD and it clicks away regularly because I'm running bitcoind but I actually quite like the sound of the HDD so I'm not bothered.  You may want to run off of a USB or in RAM to eliminate this sound.

Last, but not least, it is a very good idea to undervolt your cards.  I took mine down by a full 0.1V (from 1.0875V to 0.9875V).  This reduced my stable hash rate from 830 MH/s to 724 MH/s, and this may seem like a lot to lose, but the drop in noise, heat, and power consumption is impressive and I highly recommend this.  The MH/J of my system is now very high (2.38 MH/J); I was barely over 2 before.

With all of this I can finally tolerate the noise level.  It would be nice if it was quieter but I can't think of a way of making this happen without installing water cooling, and I would have to be careful to get a quiet reservoir (I believe my system is quieter than some fully water-cooled systems already).

I'd be interested to learn how you fare with voltages this low or lower (I currently have little information to go on and am trying to improve my MH/J).

Given that coolers on cards almost always suck in air from the front and blow it out the sides it would be better to blow cool air between the air than try to suck warm air out.  If you check out The Koolio's pictures you'll see that he is of a similar opinion http://forum.bitcoin.org/index.php?topic=7216.msg324784#msg324784 (http://forum.bitcoin.org/index.php?topic=7216.msg324784#msg324784).

My first card is always about 15-20*C warmer than my second because it is sucking in air which is being heated up by the back of the second card.  I have no chassie fan and my coolers are a full 3-pci slots wide (meaning little space between the two cards) so the effect is significant.  I've recently installed a second CPU-sized fan blowing air onto the back of my first card (of course, at a low speed to keep noise down) and this has helped significantly.  My temps are now 59*C and 47*C respectively (with my window closed).  Perhaps best would be to have a chassie fan on the top (two if your cooler has two fans) and a cpu fan blowing the back of the hot card.  With all the fans turned right down the cooling should still be effective and you can reduce the speed of your cards fans a little more (if they are still audible).

I was running my case with the side off and a box fan blowing at it thinking it would help with temperatures. After getting annoying with the box fan, I put a 120mm in the side of my case (antec 900) and put the side back on. Temps are great.. 2x 5850s at 900mhz core sitting at 58*C and 62*C respectively under mining load. The key is to make sure your cards are getting fresh air intake.

Also, I don't think it is helpful to run in an open air environment. A good case will be designed as a wind tunnel sort of.

I agree, if well designed a case can actually help to keep your system cool.  With just 2 graphics cards you might just about manage with a well designed case and you could put in sound insulation then.  With heavier mining I think the majority of the people posting on the pictures thread have the right idea and are cooling their cards much more efficiently than could be arranged in a case.

Just for fun I decided to put all of my fans to maximum and leave them for 30 mins with the Window and door wide open.  My temps plummeted to 44*C and 36*C respectively :).

Definitely go for water cooling. It is easy to scale, and can be more efficient in the long run if you know what you're doing.