I cannot say this with enough emphasis: Get in gear and go vote.
Stand in line for a long time; take a little stool and wear comfortable shoes; pee in a can or wear Depends, I don't care.
Double check your polling location.
Bring two forms of ID (one with a photo and one that verifies your current mailing address, just in case there's an issue)
Bring along the contact info for ACLU voter protection:
phone 1-877-523-2792/email at firstname.lastname@example.org
Read directions carefully and take your time with the new electronic system.
[And now, a special messge to members of the youth vote:
I've already had to tell someone's undergraduate sister living in Mississippi, but wanting to vote absentee in Texas, that she can't vote today because she waited too long and missed her deadline for sending in her application as well as her ballot. Are you freaking kidding me??
If the undergraduate population's inability to plan ahead blows this for us I will be seriously pissed.
This goes for all the little old people down in Florida, too.]