<!-- digg is done serving you. 2.01355321270u 137.03599911 6.6742x10-11m3kg-1s-2 6.6742x10-11m3kg-1s-2 --> those constants spell out (of course) digg. Barely an easter egg, but thought I'd throw it in.
There's a key-sequence that mimics a cheat from some game that will expand the comments completely. You can search digg for it if you're curious.
I think that because websites do change more often than desktop environments, people don't look for easter eggs with the same passion. And maybe because the effort involved in building and distributing a website is so much less than building and distributing a desktop application, that makes it more ephemeral, and programmers less likely to put in the time to build elaborate hidden functionality.
The constants thing was there for over a year before anyone noticed it.