I'd hate to think of the legal implications of hosting information the government deems confidential, within the United States. I imagine there will be some fallout over this for people mirroring in the US.
I contacted Linode earlier this afternoon, and they very politely (and reasonably) said no. I'd also like to find a VPS for this. One in a foreign country with no good reason to release their customers' billing information would be extra nice. So far, the most promising one I've found is PRQ -- which already hosts Wikileaks.
"In any case, your account wouldn't be suspended over it - we'd simply forward you any takedown notices we might get as usual and give you ample time to respond (you'd only get suspended if you ignored dmca or other takedown notices)."
Apparently 355 people have decided it's worth the risk. I would honestly love to host a mirror but I'd be hosting it on an AWS server in Virginia which would almost certainly get my account banned. If I had service outside of the US I would host a mirror in a heartbeat.
http://en.wikipedia.org/wiki/Streisand_effect