Dwolla changed their API, MtGox is setting things up to work with the new API until that is finished transfers will be delayed.
Or that is what is going on..
Lol, I
may be getting carried away just a touch..
Still, I hope for the traders' sake that they all stay blissfully Van free...
Enjoy it while it lasts, gents, this is still the golden age for the wild wild BTC west