Spam

It seems as my site has been around longer and longer, going on two full years this month, the spam I get in the comment section has been getting more frequent. I'm having to deal with at least one or two bits of spam a day which is totally aggravating.

To stop spam I'm looking at making people sign in before they comment. However I still want real comments and I'm worried the trouble of signing in might prevent legit people from commenting. So what do you think? Will you still comment if you have to sign in, or will that be the end of it for you?