I know they can grab .com's, I assume .net and .org just the same.   Bodog casino had their .com snagged, they moved to .eu so I assume these are safe.  However, I am guessing you don't want to buy it from a US based domain registrar as they could be forced into revealing who owns it and into taking it down.  Can anyone recommend a registrar that I'll be reasonably safe from the US government?  And for that matter, a hosting company with inexpensive VPS servers that won't cooperate with the feds?