Yup, possible, available and pretty easy to do.
WP 2.9 (the version released a week ago) has the ability to attach a thumb/image to each post. So you could make a passable one yourself in the new version provided you know a bit of php/css. Otherwise go with the great list bi has posted ;)
I hacked up a tube manually in version 2.7, so i didn't have to chenge themes... and it works really well!
Good luck with it!
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