Aniplex announced recently at their Anime Expo panel that the company has licensed the Durarara!! anime series for a 2011 release in North America. The series will receive a full dub, with the voice cast set to be revealed at Otakon later this year.
Aniplex have also erected an official site for the series, which you can visit here. And for anyone in Europe who missed it, Beez Entertainment in the UK have licensed the series as well, although, Beez only plan on releasing the series with the original Japanese voiceovers accompanied by English subtitles.