Extension.fm is really quite awesome. Once installed, when you view a page (or your dashboard) that contains mp3s, they get added to your library (sortable by blog, artist & album).

Another great feature is that whenever you play an song on a page, it gets played in the plugin (and not the page) meaning you can close that page, or go elsewhere and the song won’t get interrupted (probably my biggest gripe with web-based music).

My only feature request would be shuffle functionality. If you need some fodder to fill your library, stop by ♪.tumblr.com & eplp.