Last.fm is a pretty popular service for listening to music tracks online, we love it so much that we have the Last.fm application for Nokia N95 and also recommend it to convert Firefox into a Music Hub.
However you cannot easily download the music you listen to on Last.fm, but there are few tools which you can use to easily download music from Last.fm.
The Last.fm downloader is a Freeware tool that will allow you to download music from Last.fm, just enter the URL of the song you are playing, in-fact you can also download music from similar artists and tagged music.
All downloaded files are named "Artist – Title.mp3" and saved in the "Downloaded Files" subfolder. If you check the ‘Deep folder layout’ option, the files are stored as "\Artist\Album\Artist – Title.mp3". ID3 tags are automatically generated. Even the cover images can be downloaded.
Last.fm is portable software, so you can download and use it anywhere, by carrying it on your flash drive.
Disclaimer: The post if just for informational purposes, please check your local copyright laws, before you download music from the internet.