I've started some new groups in Last.fm:

The Beatnik Group, which likes to go with poetry, blues, jazz, folk, experimental music and all of it:
http://www.last.fm/group/Beatnik

The Science Fiction Music Group, which features a very broad range of music from Space Rock to movie themes, etc:
http://www.last.fm/group/Science+Fiction+Music

The Born in 1953 Group, featuring a selection of music chosen for people who have attained the same great age as myself:
http://www.last.fm/group/Born+in+1953

The Born on August 9th Group, dedicated to musicians born on this fantastic day:
http://www.last.fm/group/Born+on+August+9th

and, just for a laugh, the Various Artists Group:
http://www.last.fm/group/Various+Artists