A new seed of safari is available to developers today for lion and mountain lion
seed note says:
Focus Areas:
Please focus testing on the following areas:
 General website compatibility
Accessibility
Viewing and annotating PDFs
Login autofill
Password autofill
Setting and using break points in Web Inspector
Extensions
seed note says:
Focus Areas:
Please focus testing on the following areas:
 General website compatibility
Accessibility
Viewing and annotating PDFs
Login autofill
Password autofill
Setting and using break points in Web Inspector
Extensions