Javascript coolness and bleeding edge Safari
Joyful JavaScript with the Prototype library. Also worth the comments, such as this link to some possible drawbacks.
A good rundown of beginning Ajax links from Rushi.
Also, you can get the very latest WebKit here, which I may try out just to see about fixing some of the hideous memory leaks that make Safari such a pain.
In closing, I'd like to say that I love the Spanish word for chainsaw: motosierra. And captchas are so yesterday, thanks to kitten auth.