Yes I did this too. I found some great links this way. I was crawling a web of links.
Also I bookmarked some random mp3 files and used the same tag for all of them. Then o took the RSS feed for that tag and subscribed to it in iTunes and then I had a custom podcast I could add to anytime just by adding a new bookmark.
i remember writing the code to enable that to happen. only took an afternoon. you could also get an rss feed of EVERYONE's mp3s under a given tag, and have a group podcast feed...
Also I bookmarked some random mp3 files and used the same tag for all of them. Then o took the RSS feed for that tag and subscribed to it in iTunes and then I had a custom podcast I could add to anytime just by adding a new bookmark.