Bloglines have some small-but-important modifications to their site. One includes mapping navigation keys to the page, so that you can navigate through articles or folders without having to use the mouse.
The new feature I appreciate the most is the change to the new message count. It's now a combination display of new messages and keep-as-new messages. Example: (2:5). It's a small thing but saves me a lot of time while navigating their site.