GTA/VC does too (not an FPS, but worth getting anyway), AFAIK, but I lent my copy of VC out so I can't check.
UT/Quake3 engines are popular engines (Wolfenstein, MoH, CoD, JK2, UT, UT2k3, UT2k4, Quake 3) - don't know if the widescreen will work in all though.