Try Hammermill 08629-0 paper (Brights-Ultra Orange) for that Princeton touch.
Small flyers to leave at health food stores, bike shops, coffee houses, etc.
Stick them on bikes!
Avery 5979 Flourescent Laser Labels highly recommended
Includes famous Critical Mass Rap
3-fold format, printed on both sides; if you can't do this, print one copy and duplicate
Brochure in MS Publisher format