I'd argue that "cute obfuscation" techniques aren't needed anymore... gmail's spam filter is pretty good...
Of course, if you put your real email here you're a little crazed.
I haven't done this on this site, but on other places I've used this to identify some subset of people that I want to contact. Superficially, that sounds like spamming but I'm not sending mass messages or advertising or wasting people's time or contacting people that don't want to be contacted.