I proposed earlier, somewhere! :-), that we make categories only when we have x number of links to them, otherwise we are making a bunch of category pages for one wiki. It also might be a good feature to let newbies fill in the categories... not sure, just a thought. Best, MarkDilley | talk
Hosting, free vs. commercial
I'd like to suggest adding a couple of categories, specifically Category:Commercial, Category:FOSS and Category:Hosted.
This would allow visitors to see a listing of all free and open-source, or all commercial wikis. The third category would allow a view of all of the hosted wikis, e.g. EditMe, JotSpot, Socialtext, PBwiki etc.