Soc522- Sounds like you definitely need to explore the trails around Corvallis more... I suggest Area 51, Extendo, Patterson Ridge, and McColluch Peak. Up in Falls City, between Corvallis and Salem, there are also excellent trails with insane stunts.

Khuon- Yes, 23 miles of epic singletrack on the McKenzie River. I definitely recommend checking it out sometime. When you do, let me know and I'll join you!