Some friends at the office were moderately surprised when I mentioned to them that anybody can search the NC voter registration database, which will tell you not only whether a person is registered, but also where they vote, what party they are affiliated with, and which elections they've voted in previouisly.
I'm now at last unaffiliated. You can also see that, after going 3 for 3 since 1996 (when I turned 18 on a Presidential election day no less), I failed to vote in the last midterm election.
Don't worry, it won't happen again.