Sizzle

Browsers are getting faster (see: Google Chrome, see next release of Firefox) with JIT compliation, improved Javascript VM's, etc... but not only that, developers are getting better at writing codez and finding things in browsers... all of it makes the interwebs better: It's good to keep an eye on what is coming down the pike, as they say:

John Resig (jQuery author)... is working on Sizzle... which will become part of jQuery... check out the performance here:
http://jamesdonaghue.com/static/peppy/profile/slickspeed/#

Here's a link to Sizzle on GitHub: http://github.com/jeresig/sizzle/tree/master

Also, it was bounced around today on the Prototype mailing list that Prototype (traditionally slower than other mainstream libraries when traversing the DOM with CSS Selectors), is mulling over including Sizzle as well. Very nice developments -- check them out.