I created a tag cloud from all the KM feeds I pull into Bloglines and placed it in the right side-bar. TagCloud is the nifty little beta service that makes it happen! In their own words:

TagCloud is an automated Folksonomy tool. Essentially, TagCloud searches any number of RSS feeds you specify, extracts keywords from the content and lists them according to prevalence within the RSS feeds. Clicking on the tag’s link will display a list of all the article abstracts associated with that keyword.TagCloud lets you create and manage clouds with content you are interested in, and let’s you publish them on your own website.

I would like to reverse the process and create my tag cloud and have a service find the appropriate feeds for me. Someone working on that?