I particularly love Eos' work for many reasons, not the least of which is the witty, IC banter that characterized the show's early seasons. While my all-time favorite is the Lost Causes series http://bit.ly/8dbYUu (I especially love the fleeting but spot-on image of PPTH on the Serengeti), you'll probably also enjoy Matchmakers http://bit.ly/wxRMTB, in which everyone tries to set Wilson up post-Julie. You've probably read these both, but I felt compelled to share for others who haven't.

Another personal favorite, first-time fic is daasgrrl's post-Amber "On Boats" http://bit.ly/zDNBJs.