Just got word about Freindfeed, an aggregation service that let’s you share all of your different social tagging and bookmarking activity, along with an RSS feeds, Flickr photos, etc, all in one place.
This is a great way to stay on top of your friends bookmarking activity in addition to providing others with access to what you are bookmarking as well.
Go here to see my personal friend feed, and take a look at my most recent activity across social sites like Digg, Delicious, Last.fm, Stumble Upon, and more.
If you have a friend feed yourself, feel free to drop it in the comments!