I use Connotea (though not enough, I need to make it a habit) and like it. It’s a ‘social bookmarking’ reference management system. I just noticed a new feature added recently in beta that allows you to put your references on your web site. This could be useful and allow readers to see some of the stuff you find interesting and useful. We’ll have to consider adding it here. CiteULike is another such service, but I haven’t seen this feature.
If you have a blog or a lab web site, thought you might find it interesting.