NaturalPoint, whom produce the superb TrackIR series, have updated their list of supported game titles enhanced by the TrackIR 4 and TrackIR 5 flavours. Recently added game support includes, but is far from limited to:
Colin Mcrae's DiRT3
DCS: A-10C Warthog
Trainz Simulator 2010 & 2012 *Australias longest running original game franchise - support Aussie game developers!
OMSI Bus Simulator
F1 2010
Have you offered the TrackIR for sale yet? If your customers love "serious gaming", this is a must have product for them. Get it listed!