Trexy - a similar idea to Trailfire, but not really, what it does is records a trail of the sites you click on from your search results from a particular search engine. If you search “wiki” you will get a list of trails from various users, each trail will show you the path (websites clicked on) that the user followed.
It’s also used for personal search management as you can search your own trails. Other search based lists are JetEye, Prefound and Zingboxx.
WorkLight - web-based RSS Reader widget, also reads secure feeds.
Jaiku Channels - Jaiku is a micro-blogging and lifestream social network. They have now released channels, akin to a communal user space, posts made here will not appear in your user stream.
I like this idea that you can micro blog about a topic, and it also lessens that chat problem that happens on these micro-blogging networks. Groups/channels are inevitable, Twitter occasionally showcases a communal user space.