Dude. Don't offer up your banners for promotional use, no matter how you THOUGHT they might be used, without an explicit ToS if you don't want them used for PROMOTIONAL PURPOSES. Seriously, kiddies. Warp1 had a page of banners and such for people to take and use if they cared to promote the site. That was the purpose of that page, and the banners on it. Everyone knows if you have a page like that for your site, that's what the banners are for unless you say differently.
SO WHY GET PISSED OFF WHEN SOMEONE USES THEM FOR THAT??
Illegal? Come ON. Stop trying to couch everything in "zomg it's ILLEGAL just because I don't like you doing it" bullshit.
Everyone is so touchy and so easily offended, and it's just plain silly and childish.
However, on the other side of the coin...
Kudos to you for giving me yet another good laugh. :)