I figured someone else would mention the thousands of former AARP members who publicly tore up their membership cards and resigned their membership after the AARP strongly supported the Medicare prescription drug scam.

But since no one has, I'll throw it out there...

Here's an article about their positions on health care issues. I wasn't aware of most of the history that this story details - in fact it's pretty surprising to me. I don't really know what lobbying positions the AARP takes on other things, but this one alone is enough that I wouldn't consider membership unless there's a sea change in their philosophy.