I had some problems with rhytmbox music player and the current direction of Gnome3 project. This lead me to look for an alternative music library browser and player. One nice looking GTK player, gmusicbrowser, had layout themes that resemble rhythmbox. However, most of my metadata for songs; ratings, play count, and last played, were stored in rhythmbox formatted files. There was no way to import the data into gmusicbrowser. To solve this problem, I created a script based on the lastfm2gmb.pl.
This script has successfully imported and updated over 2,000 songs with the metadata from rhythmbox.