Web-based Tools

Lately I’ve been hearing about a number of web-based tools that replace localized functionality, such as Del.icio.us and web-based news aggregators. Del.icio.us is certainly a winner, and I’ve already started loading my bookmarks in to my account. I’m still searching for any good online RSS newsreaders, so I welcome any suggestions. I’m trying Google’s and Bloglines to see how they turn out.