Carl0880 of the CN forum likes to play with statistics, and came up with the following for us:
Starting with the 2000 Tour, Bernie Eisel (HTC-Highroad) has been a part of 21 road stage wins by teammates in the TDF. That puts him tied for 2nd among all riders in this time, behind Georgie Hincapie (BMC) with 22, this doesn't include the 3 TTT he also was a part of (And the 1 stage win he has) He is tied with ex-teammate Michael Rogers, now with Sky.
Hincapie has in fact been a part of a stage win every year except for 2000 (Armstrong's stage win was a ITT) and last year with BMC. Out of those 22 stage wins, Hincapie has assisted 7 teammates in stage victories (Armstrong 8, Savoldelli 1, Popovych 1, Alberto Contador 1, Cavendish 10, Burghardt 1, Cadel Evans 1)-