We've all seen it. A computer with infinite knowledge on infinite subjects. Can communicate with anyone and do just about anything. For this thread, only computers that are machines. So Data from TNG would be acceptable but Chuck from Chuck would not. As CJ always says, please include picture, where its from, and what you like about it thats awesome.
Just to get us started, I'd have to go with Holly from Red Dwarf. After all, he does have an IQ of 6000 and did pull off the joke of the decade.