Prevent Spam Comments by Adding Image Captcha Module to Drupal Blogs

I woke up this morning to see 20 comments on two different blog posts, most of them posting a link to see Lindsay Lohan nude. I installed the Drupal Captcha module and configured it to hopefully prevent any more spam. A couple notes about getting this right. For me, the default font was unacceptably hard to read. I had to install additional True-type fonts by creating a fonts folder under the modules/captcha/image_captcha folder and copying in a number of fonts. I used the "liberation fonts" that I had downloaded previously. The spam stopped immediately...