I think I've played one game of Vampire since 3e came out. In the past I played WFRP, Shadowrun, GURPS, Star Frontiers, Rolemaster, Palladium, TMNT, Rifts, Heroes Unlimited, and maybe others in addition to D&D.
Its been all D&D for a number of years for me (I include OGL d20 system Arcana Unearthed/Evolved, Pathfinder, etc. as D&D though).