My favourite games for the Gizmondo are;
Trailblazer
SSX 3
Conflict Vietnam
Chicane
Colors
The last 3 weren't officially released but there are official pre-release or gone gold complete cased versions of these games around, definitely worth seeking out.
Other games worth checking out;
FIFA Football
Sticky Balls
Carmageddon
Richard Burns Rally
Hit And Myth
Hockey Rage
P.O.D
Cheers fella. I will be going for those first.