Surprised I couldn't find a thread on this already (if there is one, feel free to close this one.)
http://www.reddit.com/r/Bitcoin/comments/tp0xt/dwolla_changes_tos_to_prohibit_bitcoin/Part of me is glad that they are about to lose a huge chunk of their userbase, because after the fraud they committed against Tradehill (and several other exchanges) it seems like none of us should be using them anyway.
OTOH, I am not surprised a lot of people in the US still use them with MtGox, just because the fees are so low.