One measure I just googled and found a stopgap measure to help users of Blogger.com to avoid spamming comments.
In your administrative box, go to Settings/Comments/then click 'yes' next to Turn on Word Verification. This requires that several letters be copied in order to post a comment. A new feature recently added.
One problem. When I tried it, I couldn't read the first set of darn letters. If that happens, hit 'back arrow', then hit 'comment' again. You'll get a different set of letters. I could read the second.
Sorry for just one more step, but I've deleted two spam comments already this morning and two yesterday. They're increasing.
A thursday p.s. this is the first morning of three now that I've opened the blog not to find spam posted. Let's hope this continues to work!