They say that SPAM bots are really good these days and can figure out your e-mail out of many "traps".
I wonder, if they can catch it out of something like this:
<a href="mailto:firstname.lastname@example.org" onmousedown="this.href=this.href.replace('.nononono','')" onkeydown="this.onmousedown()"> contact me</a>
I prefer to think, they don't and that they'll crush their ugly spammy teeth on this! :]