iPhone/Android/BlackBerry: TuneWiki does pretty much everything your phone's built-in music player does, then does much more. The notable feature is real-time lyrics display, but TuneWiki also geo-locates songs playing near you, shares favourites on social networks, and handles radio admirably.
When we say everything your built-in music app does, we mean it—on iPhones, TuneWiki continues playing music you've queued up even after you close the app, by pushing your playlist over to the default music program. TuneWiki makes it easy to recommend songs via Twitter or Facebook, and can optionally show your rough location to other TuneWiki users, creating a map of music tastes.
Lyrics display, though, is where TuneWiki really shines. The app looks up lyrics to whatever song you're playing and scrolls them in time with the song, enabling better impromptu backseat sing-alongs and bar argument resolution. If you're playing streaming radio, TuneWiki can still grab lyrics, but you have to point it to the correct line in just the first song you start playing so it knows where to jump in.
TuneWiki is a new free download for iPhones and iPod touch models running the 3.0 firmware, and has been available in the Android app store and for BlackBerry.