Welcome Squirrel Guy!
Here at BikeForums, you can even find some interesting potential for trades in one of the sticky threads...
I have personally done a few small trades, and it has been fun.
It is also amazing when someone mentions in a thread that they have their eyes open for a specific bike or component, and one of the next messages will be "you have PM" (PM is private mail)
Speaking of which, I am late mailing some items I have promised to others... Some pedal dust caps will be mailed this weekend.