So I'm running iDeneb 1.4 (10.5.6), but I'm a bit concerned about the multiple "I bricked my system" reports from the 10.5.7 update. So I've avoided it for now.

However, I wanted to update Safari beyond the 3.1 install that came with iDeneb.

I browsed The WebKit Open Source Project, which is basically the underpinnings of safari.

They release daily updates.

Downloaded, installed, and now browsing with Safari is much faster.

Haven't noticed any stability problems either.