G-Force -- PC/Mac
Want an alternative visualizer to the default iTunes visualizer? G-Force from SoundSpectrum is a great choice. I stared at it for hours, then I felt ridiculous and went outside. Free trial version, Gold version for $10. The Gold version has so many more features that I recommend the upgrade.

AudioScrobbler -- PC/Mac
Report your musical tastes and get tune ideas from those with similar style from Audioscobbler.com. You’ll need to download the plug-in for iTunes and sign up at Audioscrobbler for the fun to begin. Kind of like Amazon’s “people who bought this also bought”... but better focused.

Now Playing -- PC only
With Now Playing, you can publish what you’re currently listening to in iTunes on your blog or website! Lots of configuration which varies depending on your site type, so read the instructions carefully.

You can also find a few more great iTunes plug-ins for Mac/PC platforms at pluginsworld.com.

Have fun!
Sarah
sarah@g4techtv.com