Here are some screencasts (no audio) for the the new UI enhancements matsuu and I added last night.
The first one is Shadowbox.js, the lightbox-ish media player that uses JW Media Player. Fortunately we used JW Media Player already, so the changes we needed to replace JW player with Shadowbox was not that big. (You might have noticed that with the mousemove events over the channel image gives a random list of video thumbnails in the channel, a la iPhoto/MobileMe style. That's a new thing as well :) This feature is under the development and you can get the code from shadowbox branch.
The next one is jGrowl, growl-ish jQuery plugin to display the notification window with an animation. So whenever you refresh the channel and if there's a new item in it, you'll get notified. This is not Mac's Growl, but the one that lives on the browser! This feature is ready to be used so it's in the master branch you can git pull from. (Note that this is quite a hack for now, since the plan is to eventually replace this with an upgraded server side asynchronous events using technologies like Comet.)
git pull the latest code and enjoy!