Well, I'll comment on the last one to help keep it going
(V5N) - It's a nice idea, but currently I can't see much there. Half of the services are listed as under development and the forums are 404. However, the design is nice and the two sites that are online look nice.
One thing I really like though is the "Sign In" on-page pop-up, I think that's great, Ajax all the way
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Blog Directory / Resource Website - Blogoculars. This is one of my more recent projects, a news feed based (RSS, Atom etc.) blog directory and I'm in the process of expanding the articles section.
Andy