Vertigo  
Very nice flightsimulator. Extremely realistic (and difficult, if you turn all the options on). Good looking, runs well. Thanks for making it available for linux!

Barney Hunter  
Addictive, fast pace shooting gallery. Fun :-) Very good for loosing some surplus work-stress on friday afternoon. Request: a 640x480 screen mode for non-adjustable screens.

Octi  
Nice gameboard, decent graphics, compiles and runs smoothly. The game is complicated and you will need to find some other players to enjoy it properly. I'm really missing the computer player(s)!

Tetanus On Drugs  
not a review (haven't played it enough but it's cool!) but a remark: it's not only ported to DOS and Windows, but it works without modifications on Linux as well. And the source IS available, in the zip file.