You need to create a separate miner for each card. GUIminer has an option for this in the File Menu. If you do not use crossfire you will get better speeds, but you will either need a second monitor or a dummy plug to get Windows to recognize the other card outside of crossfire. (At least I think this is the issue, it isn't clear if you are already doing this.)
Since laptops don't pull too much wattage it may still be worth it to run a CPU miner like Ufasoft's Miner, though only if your electricity costs are very low.
You do not need OpenCL for Ufasoft's miner.
Ok, so I setup the laptop with ufasoft, its pulling about 20 mhash not anything to be excited about but I figure its enough to cover btcguilds donation percentage. As I game alot I'm looking into a dedicated miner, which will be placed in an office space and not in my room (As it is a sauna in here) I suppose I do have to look into dummy plugs as the only multi monitor setup is located in the room. Did whats suggested for now atleast and its pulling higher Mhashes so thank you! (I tried it on this desktop, pulled about 80mhash, but meh... it takes away from the GPUs)
The mining rig I was putting together in Newegg totaled to about $650
Sempron 140 2.8ghz (Possibly unlockable to an athlon apparently?)
The cheapest ASROCK Dual PCI-E 2.0 X16 Motherboard (DDR2)
1GB of the cheapest ram
a Corsair 850w PSU (it was 2nd highest in "best ratings" category)
and Two ATI 6870's totalling $349 together (was cheaper then the 6850)
OS would be XP, as i still have some keys for it... I cant imagine
If it yields over 600Mhash though, it should pay for itself within a month or so I'de imagine.
I also experimented abit with a Sapphire 5770 Juniper stock (Not vapor-X)
that doesn't use the phoenix cooler, or those open aired ones... Its in between I guess.
A little OC/UC 960/1000 with Afterburner and tuneup utilities brought it up to 210mhash