The opportunity? Well, again, there are many, but if I was an XML datastore provider like iPedo, Sleepycat, Software AG, or soon, IBM, I'd be looking for iTunes-like sexy opportunities out there to get developers excited.
Also, it's cool that Steve noticed the post, and kept the idea-thread going from his bookmarks, to
my post, and now to his. I know that's how this crazy weblog/RSS/social software stuff is supposed to work, but it's rare, for me, to see it happen.