Comment spamming is very prevalent in the blog-o-sphere (godDAMN I hate the word Blog.) There are a large number of scripts and plugins written to help defeat it.

I use WordPress, and am a big fan of Spam Karma. Not sure if it's been ported to GM or any other platforms, but its only one of many solutions.

Nothing special about those comments. Typical fair. They will start to increase in number and frequency, just as email spam does.