A buddy and I were poking around at the sample scripts at http://tide4javascript.com when my buddy noticed a crc32 implementation. I followed the trail and found a number of interesting utility scripts at webtoolkit.info.
I thought they were pretty worthy so I wrapped them up and packaged them as a utility library and posted it here:
http://cachefile.net/scripts/webtoolkit.info/
I also added a test page, which also makes for a decent quick and dirty demo page.
http://cachefile.net/scripts/webtoolkit.info/2008.03.30/test.html
UPDATE: I stumbled upon a blog post called "Top Ten Javascript Functions of All Time" (http://www.dustindiaz.com/top-ten-javascript/). I decided to append these functions. I quickly deprecated the webtoolkit.info URL and made it just "webtoolkit".