#lightmp3

How to sync up Last.fm audioscrobbler with your PSP: An easy guide

Have a homebrewed PSP, any CFW will do. Also have LAST.FM dummy!

Install LightMP3, a better MP3 player UI for the PSP

Open the app, and go to Write audio Scrobbler Log and turn it up to Yes (duh)

Once you're done listening to music on LightMP3, go to USB mode in your PSP, plug the USB to your PSP and PC.

Once you're on your computer, go to E:\PSP\GAME\LightMP3 and there you will find .scrobbler.log

Go to logScrobbler (link) and link your last.fm account with the site, then upload your .scrobbler.log file, then scrobble those songs, then delete the file to avoid any duplicates.