I've been getting lots of spam comments lately, so I changed the settings to require word verification on comments here at DET. This isn't a step I wanted to take, since I think that the harder you make it to post comments, the fewer comments you will get - and I like getting comments and having conversations start, etc. But, the weight of spam just became to unbearable. So, there we are.
Let me know if its not working right or causing problems.