You might start at Sci-Fi 3D; if that isn't the site you're looking for, you're likely to find a link there.

If you're interested in acquiring Poser Jedi, here's a few places you can visit:

Posergamers for Anakin (Episode 1) and Mara Jade.
The 3D Comic Collective for Mara (again) and Luke Skywalker.
3D Poser for Qui-Gon Jinn and Yoda.

Several people here at Renderosity are working on Jedi characters (Darth_Wookie, etc.), but haven't posted them yet.