Probably the biggest worry for people after the FinCEN guidance came out. If they start regulating getting money in and out (similar to InTrade offshore gambling) it can be very difficult. End up having to rely on local craigslist posting or something to do exchanges vs. power/liquidity of online. Haven't exchanged any for dollars or purchased with fiat but would have to imagine someone is putting new money in if the price keeps getting driven up like this. Dwolla still work?
I stopped using dwolla awhile ago when they changed their terms and conditions.
https://bitcointalk.org/index.php?topic=81945.0I think they have some deal with gox now but I haven't used them since. Bitfloor seems like the best way to purchase right now in the US, but I keep seeing complaints that they are running slower than usual as well.