Heh. I've been threatening to write yet another vi clone for quite some time now (I think the world needs an editor called evil), but every time I start I'm reminded that pretty much everything I want to do, vim already does.... More power to you, though.

Favourite features (in vim):

• Very quick movement around files. This is the biggest feature I can think of. Since I work with code all day, using an editor that doesn't get in my way and lets me jump around the file damn quick is really important to me. This includes ctags, by the way.
• Perl hooks. 'Nuff said.
• Regex search/replace.
• General programming features, like syntax colouring and bracket matching. I like vim's indent and comment options, but the syntax is a bit hirsute.

Most Wanted features (for vim):

• Perl-style regexes. Switching context from Perl regex style to vi regex style is really hard on my poor widdle brain.
• Regex-based comment/indent/syntax hilighting. I haven't looked too closely at vim 6's language files, so this may have been solved.
• Faster, smaller, fewer bugs, you know the drill.