Discovered last.fm and iScrobbler through iusethis in mid April. Have been scrobbling ever since then. Came across a number of bands due to last.fm - Beck, Incubus, Spoon - by checking out what my friends and neighbors listen to. It's a cool little tool if one's into discovering new stuff and willing to check out other people's interests.
The 'recently played' list is available on the sidebar of the blog (is that what it's called? hmm...) as well.