Not at all far, as it turns out. MobileCrunch reports that the release could come as soon as tomorrow, which is fantastic news. If you're not familiar with Slacker, it's an almost too-good-to-be-true online radio site that enables Last.fm and Pandora-like streaming, in conjunction with more tradition radio-style stations and easily controllable user-made stations.

As with the Slacker standalone player, the station content will be stored locally on the BlackBerry or iPhone, meaning that you don't need a solid 3G or Wi-Fi connection to play back your music. It's safe to say that the iPhone version, like the Blackberry app, will be free, but some features will be disabled unless you have a full Slacker subscription, a fact that holds true across the Slacker range of products. [MobileCrunch—Thanks, Daren!]