Out of curiosity I opened up my map that I used the 404 seed on in MCEdit. It is nothing but one big MASSIVE cave system. I've never seen such a concentrated jumble of branches and caverns all the way to bedrock. WOW!
The seeds generate the same world but don't necessarily spawn you in the same spot. There's quite a few other things, read that seeds thread.
This should actually be merged/locked, that thread could have this.
(I seriously doubt there will be easter egg seeds, it's a programming thing. Possible but unlikely)
if there were any true "easter egg" seeds, someone would be able to decompile the world generation code, and find them there, seeing as they would have to be hard coded into the system to be a true easter egg.
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Do what you can with what you have, where you are. -TR