Just tried installing the Collapsing Categories plugin by Rob Felty. I am hacking it in my sidebar using the php insert as opposed to the Widget. The lack of actual documentation is retarded! I have tried everything to get it to exclude categories I don't require, which was hard enough since they don't exactly tell you that there is a setup menu in the admin panel. Hold off on adding features until you can document the ones that already exist properly, it will save a lot of time for the end users. The plugin is great aside from the exclude not working and clicking on a category not sending you to the subcategory page.
If anyone has a workaround solution for the problem please let me know.