I was looking at Dick Eastman's blog this morning and saw this post about dumpster diving and identity theft. It's a good post with some very good comments.
If you are not shredding your documents you're playing with matches at the gas pump. If you ever have your identity stolen it can cost you tons of money and is a lot of work to fix.
Eastman's Online Genealogy Newsletter on Dumpster Diving for identity theft.