I've been meaning to implement a better way of browsing our Joomla templates for almost a year now and I'm slowly eating away at the todo list and have just released a simple categorisation system which should help you to quickly find the Joomla template you need for your projects.
You can see the list of categories in a popup overlay on the Joomla templates page by clicking on the "View templates by category link". The new landing pages are just simple Joomla content pages but have an instance of our microblog module serving up specific content. The result is kind of like a manual tagging system and while it took a bit of configuring it allows me to create related or deeper groupings of content without resorting to another content extension. All of the pages that get delivered from those links are default Joomla content.
For those that are interested see the overview of how to use microblog to do this below.