Looks like a good start.  The more exchanges the better, and the Bitcoin community definitely needs more competition in the exchange area.

I'd like to see automated deposits to make the process faster.  The website says Dwolla deposits take up to 24 hours, and Bitcoin deposits are manually processed and may take up to 12 hours.  Manual processing won't scale very well and will take a lot of your time, so I think that automating it will make you and your users happier.

I guess Dwolla's API isn't sufficient to automate Dwolla deposits in real-time yet, but maybe you could add your vote to this thread or start a new thread describing your needs:
http://www.dwolla.org/d/showthread.php?510-subscribe_notifications-POST-notifications