The guys over at Grooveshark are going back to their roots: they have just released a brand new 2.0 version of their iPhone client in Cydia, where it all started. Grooveshark, in fact, released the first version of the music client in Cydia in 2009, when Apple didn’t want stuff like background streaming on its iPhones and iPod Touches. Last August, though, Apple revised its rules and approved the Grooveshark app - just to pull it a week later due to a complaint filed by the Universal Music Group UK.

As it turns out, the promising music streaming startup has grown tired of Apple’s rules and limitations, so they’re going back to Cydia. The app has been released for free under BigBoss’ repository.

Grooveshark 2.0 for iPhone looks beautiful: it’s highly custom, and it somehow reminds of Tapbot’s design style. Dark, with shiny elements here and there, big square buttons and blue switches. I like it, and I think many of you guys will use it just because of its interface. As for the feature set, the app now supports iOS 4 multitasking and the Retina Display. You can both listen to music in the background and enjoy an high-resolution icon and UI. Search results can now be filtered by song, album and artist (pretty useful) as well as by user generated playlists. The app now also come with a set of built-in radio stations.

The most important feature, however, is the complete redesign of the app: just like the official Facebook app for iPhone, you have this dashboard with a grid of icons on it you can use to navigate between the different sections of the app. Animations are fast and fluid, but I’ve experienced a couple of crashes. I guess a bug-fix update is on its way. I particularly appreciated the fact  that the app also supports iOS’ music control widgets in the multitasking tray.

Grooveshark for iPhone looks great and it’s free in Cydia.