If you're a Windows Phone user and also a music/Last.fm junkie, you'll be glad that there is finally an app that does a decent job with scrobbing your tracks to your account. Unlike other scrobbing apps that had an awkward way grabbing your media information (songs currently/previously listened to), for example, the app would only scrobble if you opened the app before you starting playing your tracks. Well ScrobbleMe scrobbles in a different compared to other apps in the Windows Phone Store (almost said Marketplace).
ScrobbleMe allows you to open the app when ever you'd like after listening to your music (no expiration for tracks scrobbled). It grabs your previously listened-to tracks somehow, possibly the same information in which how Zune Social would store the information, which is probably hasn't changed to what is now "Xbox Music" because more social features are supposed to be coming to the Xbox Music service.
Arnold Vink is the developer of ScrobbleMe, who has shown great support and dedication towards Zune/Windows Phone. He's also known for ZuseMe (Zune Scrobble) and ZenseMe (WP7 and Creative MP3 Scrobble). Check out his other app MediaRemoteMe!