I've been experimenting with Stumble Upon recently. It's an interesting web tool and social site that allows users to review web sites. It has some advantages over del.icio.us in that it allows a sort fo voting system and blogging. Where del.icio.us is more of a generic bookmarking site Stumble Upon allows for social interaction and better sharing of links.
Anyway if you want to check out my Stumbling feel free.