Glimmer, A wizards based tool to create animations and interactive elements by harnessing the power of JQuery: http://www.visitmix.com/lab/glimmer
A Channel9 Show about Glimmer: http://channel9.msdn.com/shows/The+Knowledge+Chamber/Tim-Aidlin-Glimmer-a-JQuery-Interactive-Design-Tool/
YouTube videos about customizing MOSS UI: http://shadiesm.blogspot.com/2009/06/how-to-customize-moss-ui-videos.html
Emad's Blog 