heh. i did a little research on this. allow me to present my findings.
there is software that scours the web for email addresses.
i put one on slashdot as "fscked@NOSPAM.md.prestige.net" for an address of... well, @md.prestige.net. Guess what?
Spammed. Every day I get spam there.
Either a human grabbed it, or their scouring software is getting smarter.
If it's the former, there's not much we can do about it. If it's the latter, then the more obscure, the better. they won't recognize pipes, so my email addy is safe