Agreed with the above. I've had several emails recently of people asking me if I am taking a student, which just tells me that they haven't actually been to my website, because it's CLEARLY POSTED ON THERE. Now, I'm unlikely to remember anyone's name anyway, but some of the social psychology persuasion literature might suggest that being exposed to a name might make me recall it or think of it fondly when I see it during application season...though that isn't true if I check my email and think "Oh right, here's someone who emailed me instead of checking my website." In short, do NOT email if you don't have something substantive to ask. Sending me your CV, asking me to set up a phone meeting, asking me to read your honors thesis....don't do any of these things. Do NOT ask to come to the lab, that is not the job of a professor to show applicants around. Once you've gotten an interview, then the ball is more in your court, but you have to get to that stage first.