Pascal Van Hecke – Daily Links

Blog by Facebook's research scientist Cameron Marlow.
Who happens to be the creator of the blog tracking classic blogdex.net

Tracking on-page events using Google Analytics.
Makes Analytics useful for Ajax applications

Paying service by SEOmoz, to monitor incoming links and "trust" (according to their metrics) gained from that.
They have their own crawler!

(Yet another) change tracking website.
This one features RSS and side-by-side comparison of previous versions of a page.

Friendster, THE social networking site back in 2004, still continues to live… but outside the US.