I'm a very generous upvoter. Like I said in the comments, good info, jokes and insight get upvoted by me.
Ed, I agree. I'm always pretty good about voting up people who answer my questions with good info, and love to have discussions in the comment section. Sometimes I lose track of the questions though, and lose the thread of the comments.
EDIT: Apparently people are not so stingy with their downvotes. Gosh, I love humans.