Pentadactyl is not the new name for Vimperator, it's the name of a fork of Vimperator. Both projects still exist and are both still being actively developed.

Pentadactyl is not the new name for Vimperator, it's the name of a fork of Vimperator. Both projects still exist and are both still being actively developed. In my experience, at least as of last Friday, you have to use a nightly to get a working version of Pentadactyl, while the version of Vimperator up on the Mozilla add-ons site is fine. I'm personally using Vimperator, just b/c I haven't yet had an itch that it doesn't scratch, and I'm not really clear on what Pentadactyl actually does better (because I'm too lazy to figure it out myself and haven't been able to find a current bullet-pointed list that tells me).