Blog Spam The Next Big Annoyance?

See previous post's comment:

'Thought & Humor' said...

Thought I would stop in to say, "Hi"!!!

Howdy
'Thought & Humor'
Cyber Humor
http://ilovehowdy.blogspot.com/
Harvard Humor Club
http://groups.yahoo.com/group/Harvard_Humor_Club/

I'm always glad when one of the millions (billions?) of people who visit this blog (hi mom!) leave a comment but the above is nothing more than a random invitation to visit some humor blog I've never heard of. A quick google search shows that this is not a normal passerby but a blog spammer who says "Hi!!!" on blogs throughout the Blogosphere.

Is this sort of spam going to become more common? Relevent comments only please.