Got my rig mostly setup, all housed in a homemade rack inside of a closet.  I have 4 more servers coming, the rig generates a decent amount of CPU currency (Primecoin).  I average .077CH/D per server running Xolominer.  Total of 9 servers at the moment. 
Each sever is configured with
-Dual L5420s
-4GB of RAM
-Flash Drives for Boot
Should also note that the cooling setup lowered temperatures about 10-15C, down to 66C. In addition, cut the noise to a tolerable level.



Was looking at investing in liquid cooling and reducing the number of fans for these, but the air cooling seems to do the trick quite well.  Thinking about adding graphics cards to these machines... Can't really decide.

Would love to see proof, video of system mining and the beeeeer.org user page.  According to your stats..... you should see it raise with every page refresh.  TBH, I really doubt this is legit.  Specifics on the implementation would be cool too. 

Right now I'm pretty much in the same situation, but I started with Primecoin.  Looking towards Dual L5420's as those should in theory pull 3400-3600 Primes/Sec.  Currently with the 6500Primes/sec I use I pull about 0.08XPM/hour.  Figures are depressing, but totaled up with the L5420 lot I'm looking at I could see about 500$ profit, that's granted my rough calculations are correct.  That's the most profitable way I see it now, other than trading. Primecoin seems to piggyback heavily off of BTC, as I use BTC-e.  So it fluctuates with that, or so it seems.  Recently it shot up and made mining alot more profitable.  I plan on sticking with Primecoin for a while.  (CPU mining seems to be most profitable, in terms of mining.  At least in my eyes.)