 Framing other sites has always seemed scummy to me.  Am I off-base?
NoBSWebDesign: As long as it's relatively unobtrusive and has a prominent "remove frame" button, I don't see what the big deal is. If it weren't for their link to you (framed or not), that user would not have found your content in the first place. I would be grateful for them driving traffic to your site and move on to more important issues.