I've been using Last.fm for awhile now. It's a great service and hopefully it'll remain great even though CBS has purchased it.
Anyway, I've had my most recently listened and weekly charts displayed on the right here on my blog for awhile now but today I noticed that there were new scripts for embedding the information on a blog. WOW! What a difference. It's SO much nicer. If the title is longer than the box it'll scroll. You can click on the tracks or artists to get more information (takes you to Last.fm). Also if you hover over the artist you get a neat little thumb nail of the artists' picture.
Frivolous? Yup. Cool? You betcha!