You can add a bunch of "tags" to a "My Tags" section, presumably stored as cookies. This means you can quickly and easily jump to those stories. The most useful feature of this is that the stories with a particular tag have an RSS feed. So you can subscribe for all stories truly local to you which is quite cool.
Video now seems to be served using Flash video, which is a massive improvement to the proprietary, not-very-cross-platform crap they used to use. At least it means Linux users will now find it as easy to watch stuff as YouTube.
Overall, quite impressed so far! Then again, they haven't turned on the ads yet.