A couple of OPML pages to test, and a request for feedback

Lately we’ve received a few different feature requests regarding OPML pages/files for public portals, and so we thought we’d open it up to the community for debate.
 
How should Zimbio support OPML?  Should we offer an OPML file or OPML page for each portal?  Should we nest our outlines so each portal’s Feedroll has its own category, or should we just keep our outlines simple and flat (which is less cool, but may be more broadly supported)?  Should we include all links and photos from a portal in its OPML page, limit it to all of the RSS feeds, or just keep it clean and include only the top-rated feeds per portal?  Should we also include an RSS feed for each portal’s forum or activity log?

For now, we’ve thrown up a couple of test OPML pages for validation purposes.  Pop them into your RSS reader and hopefully they’ll help stimulate some ideas.

The test OPML pages are: 

1.