UPDATE May 2008
mooSlide 3.2 revamp is out, so forget about this here, and check out that:
If you wish to see the old version, go here
Another demo to try
Get here and click the images on the left: Demo
Other nice ajax tools
mooHorizonSlider - mootools based image slider, with fast forward, rewind etc, nice effects
jSocialize - clone of mooSocialize for the jQuery framework
mooMessageBox - add highly customizable messageBoxes to your page
mooDBTooltip - populate tooltips from your database
mooFlickr - your flickr stuff in an ajax box
mooSocialize - social network widget