This week I uploaded QTScrobbler to Debian.

If you have a music player running Rockbox, you can configure it to write a log of what you have listened to, and when, to a .scrobbler.log file in the root of your player's file system.

QTScrobbler takes such a log file and submits the contents to the audio-scrobbler website. It then deletes the log file from the player.

If that sounds useful to you, give it a go!