Well, today I finally found what I was looking for. A great PHP login script
to use on my site. There's the link if anyone is interested. I knew something like this had to be out there, and I was right. It is a preprogrammed system where users can register, login, retrieve forgotten passwords, etc.
If this site ever gets really big (cross your fingers), I may require people to register before they are allowed to nominate or vote at all. In the mean time though, I plan on enticing people to register by making registered users votes count 3x as much as a guest. In the long run, you'll also be able to make your vote count even more by consistently voting for winners, nominating eventual winners, and another contests and activities.
I wanted to make sure I got this implemented before the big contest (see below) starts. That way if your blog is in the running, you can register, and make sure your vote counts extra!