While looking around the net today for a specific control, it's amazing the number of javascript do-everything libraries that are out there. From mochikit and scriptaculous, to Yahoo.UI and Google's offering, to various ajax libraries like Microsoft's AJAX.NET, AJAX.NET Pro (the non-MS offering), and many many others, the number of choices is amazing. It seems they all have thier shortcomings, but that doesn't stop the devs on these projects to continue their broad scope.

What I came across that was a bit unusual was a framework that relies on a compiler that runs at serve time. Called Jitsu, it's yet another UI, animation, data binder, and AJAX library. The site looks pretty stale (circa 2006), but the approach was interesting because it was different.