How dose the credit system work exactly?

I have 3 Seti WU done and have gotten no credit for them. Also I have 27.76 credits on Predictor and they do not show in my stats. I think I read somewher that you don’t get credit untill 2 other people have done the same work unit and then you share the credit . Is this correct?

on a side note, When will ther be a 64bit version of the bionic projects?
I have a 64bit prossesor and am running Win2003 64Bit and would love to see the difrence.

Correct. Each of the three request a different amount of credit, based on their system’s benchmarks, and when all three are validated, you get the “middle” credit value requested.