moo.fx
Valerio Proietti’s moo.fx is described as a “superlightweight, ultratiny, megasmall javascript effects library” that is “easy to use, fast, cross-browser, standards compliant.” It certainly would seem to qualify as buzzword compliant. Judging from the examples, though, it could pretty useful for the right project. And it gives me a couple of ideas as well.
Oh, and Textpattern users now have a plugin available as well.