CPU mining and BTCGuild works perfectly, but I'd like Deepbit.
It might be actually better to stay at BTCGuild or use smaller pools for CPU mining...
"Why?"Because depending on the hash-rate you get on your CPUs at the current difficulty levels, there's a very high chance on the shorter rounds that you may not even get a share in and earn anything at all.
Cheers,
Kermee
Hey Kermee,
I have about 3000mhash/s, but I have 2 computers at my work which will get about 50mhash/s (CPU's). Thatswhy I'd like it

Care to share what CPUs these are? I have a 16core opteron 8000 server that puts out around 1.7Mhash per core. I would suggest that you be very careful running server CPUs that are capable of such mhash (I suppose they're something like X5670 or similar Sandy Bridge / Nehalem Xeons, or MagnyCours Opterons) at full 100% speed 24x7 at work. Doing so uses a LOT of electricity and if you aren't paying the bills then you can get fired for mis-appropriation of corporate computing resources. 50mhash/sec ain't worth getting fired over. Careful careful.
Anyway, to address your issues, GUI miner (and all miners) require authentication at the pool to get workloads. So I would assume you either don't have any miner accounts setup or you are failing to understand the remarkably simple UI on the mining app that has a form field for username and password along with the mining pool URL. Are you seriously not understanding the method used to login to the pools?