Advanced Week 2 - Bottom Brackets

Most of you have a 3 piece type crank and bottom bracket. This wikipedia article should help you figure out what style of bottom bracket you have:
http://en.wikipedia.org/wiki/Bottom_bracket

This is for square taper type cranks: http://www.parktool.com/repair/readhowto.asp?id=103
Splined type: http://www.parktool.com/repair/readhowto.asp?id=120

Most of you have a cartridge bearing style bottom bracket which can be removed from the frame but is not serviceable.

Here's a video on how to overhaul an adjustable (non-cartridge) bottom bracket: http://bicycletutor.com/bottom-bracket/