I get about 15-20 spam comments on my blog every day. Most are the “Thanks for that Awesome posting, it saved MUCH time” variety. They usually have a link in them to anything from Viagra ads, penis enlargement, cheap homeloans, to how to get student aid. I am currently doing an experiment to see many of the “thanks for that Awesome posting spam I get as a percentage of all the spam I get. My gut tells me that the “awesome posting” spam is about 50% of all the spam I get. I have recieved 31 spam comments in the past two days and 18 of them were the “awesome posting” comment.

"Thanks for that Awesome posting, it saved MUCH time"
I use the Akismet plugin to stop spam. It is an excellent program and for personal blogs you get a free activation key. It stops almost all my spam and because of the way I have discussion set I have to approve every comment the first time and then a person can comment without me having to approve it. It is the only way I have found in the four months I have been blogging to avoid being overwhelmed with spam.
I will probably do an update on this in a week or so. What is amazing to me is that this blog is not extremely high traffic, I only get between 20-30 visitors a day, and I still get so much spam. I would love it if I got as many legitimate comments as I do spam.