Do we have a Vimperator style extension for Safari 5?
Vimari also offers some of the keyboard shortcuts from Pentadactyl.
Not really. I've been hoping for a good one, but I keep coming back to Firefox and Pentadactyl, a Vimperator fork.
An old question, but it seems that the plugin sVim does a decent job now.
I found the extensions by Daniel Bergey useful: http://dbergey.github.com/
Have a Look at: https://github.com/flipxfx/sVim It's similar to cVim for Chrome.