Hi Ray and Julia,
First of all, thanks for the kind words. This is a great conversation, and even though we're not responding as regularly in the forums as we try to get the current release out the door, we're reading the threads to stay in touch with user needs and requirements, so this is really helpful. And Ray, you're right about the percentage of response. I used to think that the open source community operated like the hundreds of non-profit organizations with which I've had the privilege of working, where work is divvied up by the 80/20 rule; but what I've found is that it's really the 1% rule in the world of Open Source. And I'm not sure how sustainable that is, but that's another discussion entirely.
Regarding tags, I would suggest (and I realize this won't work for everyone) registering with Technorati if you haven't already done so. With Technorati, you can use their tagging system and even include a tag cloud in your blog which is generated based on the Technorati tags you've included in your post. For some, this will be an even better approach than just using your own proprietary tagging system because of the Technorati juice you'll accrue by using their system. Click throughs from your tags will help to increase your ranking in the Technorati search engine for the keywords you've used. If you haven't already started using Technorati, think of it as the Google of the blogosphere.
If I get some time, I'll write up an article on the details of how I would recommend implementing this. The short version is this. Create a Technorati account if you haven't already done so. You'll go through a process to claim your blog. Then start using the Technorati tags in your posts. You can even go back through old posts and edit them to add Technorati tags. As you add new posts, be sure to ping Technorati to let them know you've got new content waiting to be discovered. The easiest way to tag your posts for (and to ping) Technorati is to use Windows Live Writer to manage your posts. MetaWeblog support is coming in the next version of the blog module, but you can also metaPost community edition, which is free and also allows you to edit content in other DotNetNuke modules (there's a link in my signature below if you're interested).
Thanks for your feedback!
Don