Yahoo! Buzz is a good site for those who research internet trends, and also for those who are looking for new and interesting sites to browse. The site ranks stories based upon search queries, user votes, emails, and page views.

diigo.com is a slick, web 2.0 site for social bookmarking. It has some interesting functions not found on similar sites, like the web highlighter and sticky notes tools. The site also supports tags, user avatars, friends networking, groups, and communities. One of the better social bookmarking sites. Recommended.

newsvine.com is a top site with great design, something like a technorati clone with a more mainstream news focus. Updated continuously by netizens, newsvine is an instant reflection of what the world is talking about at any given moment. You can also vote and comment on posts and news stories on the site. Recommended.

simpy.com is another site that will be of interest to SEO promoters looking to increase traffic to their web sites. It is a social bookmarking site, very similar to del.icio.us and reddit. This site has no advertisements and you can upload your bookmarks directly from Internet Explorer, Firefox, or other browsers.

ma.gnolia.com is a popular, well designed social bookmarking site with a large user community. If you are looking to increase traffic to your web site, you may want to try posting your information on ma.gnolia. This site also makes great use of tags for categorizing information in a user friendly way. Recommended.