If you use a Google blog, you probably have a CAPTCHA option for helping control spam. If you turn it off, you'll have to deal with removing spam manually. If you don't get much spam, you might want to try living without it. Here are directions for how to do just that from Janssen at Everyday Reading.
You know what pretty much the entire Internet hates?
These word verification forms in order to comment on a blog post. I mean, everyone has always disLIKED them, but then Blogger went and made them unbelievably difficult (adding those ridiculous numbers) and ALSO more people started reading blogs via phones and tablets and such, where it's even MORE difficult to type out those ridiculous little "words" (could I have used more capital letters in this paragraph? No, I do not think so).
Captcha images by Andrew Steinborn via Flickr
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