Fleegix.js came in at number 10 on the list -- and frankly given its status (er, lack of status?) as a bit player on the grand Ajaxy-toolkit stage, it's pretty cool to see it showing up on any lists at all.
Actually, Fleegix.js is not new -- some of the code has been around since about 2002 -- but "up-and-coming"? Yeah, I like the sound of that.
I would love to see more people using the code, and hacking on it as well. There is a Lighthouse app for bug reports. If you're interested in pitching in, the Fleegix.js site has a page on how to contribute.