RSS (Really Simply Syndication) is a great way to share info, but unless you're into parsing XML can be a pain to display on another web page. If you're got the ability to install scripts and hack around it's no big deal, but there are some places where you're just a user and can't do that - Blogger for instance !
I use RSS Digest here to display the del.icio.us and AudioScrobbler feeds on the right hand side, and have also used it to great effect on a couple of client sites.
It's everything a good solution should be - simple, slick and reliable.
I'd like to be able to create a single account and manage all my feeds from the one place (like I can do with No-IP.com) but it's not really a big issue.