At long-last, LAST.FM has repaired their API!
(AS OF DEC 1, 2015)
For the longest time, the ability to add new API accounts was removed.
I cannot speak on the overall health of the API, but just thrilled that I don't have to use the previous FRANKENSCROBBLE I came-up with (IFTTT+FLICKR+TWITTER RSS)
Here's a simple use of the Last.fm API:
post (listening-to) albums to your site
1. Go register for your LAST.FM API: http://www.last.fm/api/account/create
3. Tweak your settings, and you're off and running! (ready for the making pretty with the CSS now...)