all are fairly useless. once your e-mail address gets out (and it will) obfuscating it is pretty pointless and just makes it harder for legitimate people to contact you. if you post to mailing lists, your address is surely out there in plain sight anyway. use a plain mailto: link and block spam at the smtp/mua level.<p>i've been using the same email address for almost a decade which is now in many mailing list archives, surely a bunch of spammers lists, and on every page of my website as a regular mailto: link with no obfuscation. my mail is filtered with sufficient smtp-level protection and maybe 1 junk message a day actually gets to my inbox.
I usually just put my email into an image and leave it at that. As previous people have said though, it is only a matter of time before your email gets on some lift. Ultimately it all comes down to the quality of your spam filter :-).