Over the weekend I released clevercactus feedexplorer, a simple free app to browse the data from the Share Your OPML commons (thanks Dave for making this resource available!) and choose feeds that you find interesting, then allowing you to save them into OPML files that can be imported into a news aggregator. It runs on Windows, Mac OS X, and other OSes.
Here is the page with installation instructions and a short user guide.
If you can, take a moment to read the user guide as it explains how to change the sorting, perform searches, etc (Btw, I think the UI is pretty self-explanatory, but reading the doc should leave little doubt as to how to do something :)).
Note: if you have any problems with the installation, please take a moment to read the installation page, as it answers common questions and problems.
More interesting bootstrapping going on around Dave’s most recent experiment