kKaltUuPlease remember that this isn't a popularity contest and you get to vote if you think someone is cheating. You are positively sure of someone being innocent, you have your suspicions or you have undeniable proof someone is cheating in the form of AC evidence.
I wish there was a moderated thread where we could just post reports and relevant evidence for later inspection. It's important that it's open, though, so that others can see the reports and add additional evidence or comments about previous incidents that wouldn't otherwise show up (see my posts in the first few pages).