I know gmail has amazing spam filters, but even I wouldn't tempt fate like that.
I've had slashdot display my email address in clear text in every comment i've made here for years now. I've never received any mail to firstname.lastname@example.org (gmail lets you add a "+whatever" to your email), and i very rarely get a spam message in my inbox. These days, with so much email being spam, i don't think that being coy about your email address is really a valid strategy anymore. You've got to give it out to use it, and who knows what the heck the people you give it out to are doing with it?
"In order to make an apple pie from scratch, you must first create the universe." -- Carl Sagan, Cosmos