I'm really liking the look of NetVibes. I've been looking at doing something like this, since learning a few AJAX tricks and stylesheet bits and bobs which make this sort of thing possible.
What would be really cool would be if the Webnotes bit has an OPML editor/renderer in there too. Possibly subscribable itself, by other people like an Instant Outline.
UPDATE: The 'Add Feed' section is ALL OPML basically. They let you import OPML nicely, right there. See the Feed Directory. Nice. That's what OPML is great for (among other things, of course). Loving the implementation.
UPDATE:
WEIRD! Ha! It didn't like my podcast OPML file. It called all the feeds 'Cheryl'! lol
AND! I was just thinking 'wouldn't it be great if it had a Flash MP3 player for podcasts' it DOES! Yay!
This could be great integration. Very nice, very exciting! :) All this sort of stuff is what I want to go onto readerss.com and writerss.com, etc. ;)