See also Yahoo's own:

http://developer.yahoo.com/performance/rules.html

There are some in common (like avoiding CSS expressions) but less overlap than you'd think.

[Disclaimer: I work for Yahoo]

Warning: Page Speed effectively kills my FF (3.0.10 on Ubuntu Hardy) _even after it is disabled_ (creepy) where I have no more than 6 tabs (with 3 of them being Google Notebook, Google Reader and Gmail).