iframes on my blog a no-no?

[Trixie]

I'm working on making http://trixie.com/ useful by using an aggregator to syndicate my own blog posts there and having a small tgp-like thing in one column.

Out of sheer laziness and ignorance, I used an iframe for the tgp section because I wanted to hurry up and get it working; my question is, what's with the opposition to iframes? I am not hotlinking someone else's content, only my own (the tgp is on one of my other domains). What possible problems could I run into by leaving it in the iframe?

Any thoughts on that or anything else you observe there? I am still working on the site, so any feedback is greatly appreciated.