Key Wiki Features
I just installed MediaWiki at an organization to manage some information I was researching. The primary reasons I chose MediaWiki were (a) it's open source, (b) it has auto-TOC (table of contents), (c) it has auto-categorization and (d) I was familiar with it already. I ran into some rough spots during the Win2K3 R2 / IIS 6.0 installation getting PHP 5.2.3 and the php_mysql extension working but other than that the installation was pretty smooth. It seems that the php_mysql extension that comes with PHP 5.2.3 doesn't work and you need to get it from PHP 5.2.2. Also, rebooting after installing PHP from the MSI helps but that doesn't seem to be mentioned in the installer. The other issue is that IIS doesn't seem to come with rewrite capabilities so I tried a third-party rewrite filter before tabling that for now. It's hard to believe that IIS doesn't have rewrite capabilities.
Some "Enterprise Wiki" solutions include Confluence and SocialText but I don't have any experience with these.
Which wiki do you like for "enterprise" purposes and what features do you find to be key? Do any other wikis have auto-TOC?