1. Enviro-Bear 2010 2. Canabalt 3. Jet Car Stunts 4. Minigore (but don't buy it until they fix the huge mistake they made.) 5. geoSpark Yup. Oh yeah, and since user "Random Guy" wants it, Tilt to Live, I guess.
Playman's Track and Field as well as their Winter Olympic version are easily the most addictive games I have on my Ipod.