well… you could probably make a wiki from combining various different plugins, which is more or less what I’ve done. I just added in a few extra bits to tie them altogether.

But by keeping them separate it does impact slightly on speed. (OK I’m probably not the best person to talk about that – I have no idea if my implementation is good or not).

All my plugin is intended to is literally be small and easy(ish) to use. It isn’t meant for larger wiki projects, but for smaller ones. So no templates, no front end editing etc.

BuddyPress Wiki Component
http://wordpress.org/extend/plugins/bp-wiki/

WP-Wiki (very recently re-booted)
http://wp-wiki.org/

Since they they’re both in early development and aren’t using any plugins to extend themselves, they even miss some of the features you’ve got now, like internal links. I’m sure either project would be happy to have you integrate a couple of these plugins with theirs.

(personally I’d prefer a wiki plugin readily integrate-able with plugins such as interlinks, as opposed to actually bundled with it.)