1. A list of all the CDs you own (www.recordnerd.com is a free and easy way to make one)
2. A CD burner and some blank CDs
3. Enough cash for postage
Here's what you do:
1. Post your list of CDs here.
2. Browse other peoples' lists. If you see a CD they have that you want, work out a trade with them (this is better done through PMs or email). Mix CDs are fun to trade, too.
3. Burn, send, enjoy!
Without further ado, my list is here.
