Ok, so having started my 3rd wordpress plugin, I thought I would make a static page to link all the content together. A few of the plugins have come from using wordpress as an internal blog / groupware tool. So far the plugins are as follows:

1) Facebook Comments - Import your comments from Facebook to Wordpress
2) Allow Categories - Permission private / hidden categories by user
3) Private Files - Make sure users are logged in before they can view images / attachments (useful with allow categories)
4) YouTube Feed - Embed you tube videos in posts and detect Facebook feed reader, and convert to a link.
5) 3rd Party Authentication - Authenticate wordpress against gmail / google apps or email.
6) Post ToDo - Add a ToDo list to a post or page.

I also intend to eventually write a document mangement and SVN browser for wordpress. Oh, also I found this great site for plugin developers which documents the various “hooks” that you can use in plugins: http://wphooks.flatearth.org