MVP, CM Punk, Mickie James, Paul London, Spanky, Jamie Noble
Actually, they've all found some success in WWE, and they're making a nice chunk of cash, so I'm sure that counts for something.
Both London and Kendrick were doing great on SD and were on their way towards become the Hardys2k, then they got traded to RAW. And London even managed to be in a couple of feuds back when the CW title actually meant something.
I'm not going to say anything about Punk and MVP... You can see they turned out pretty well. Mickie James is probably the most over diva on the roster, but for some reason she's been getting jobbed out as of late. And Jamie Noble is now an agent/wrestler who happens to be in the middle of the biggest push in his career.
And even you have to admit, Kaedon that Noble's been entertaining in his current role.
Like Rell said, they're not successful like a HHH or an HBK (Then again, not many people are) but they've all found a measure of success in the E.