Due to the recently subsided Writer's Strike, Private Practice was one of the shows put on hold. And from what I've read online, Private Practice is set to return on ABC, however us fans will have to wait until fall for the new episodes. Hang in there guys!

Source:

http://www.tvaholic.com/2008/02/21/when-will-my-favorite-abc-shows-return-post-writers-strike/