At least, on the spammers radar. Just turned comments off for anonymous users, due to a sudden wave of comment spam. Will dig out from under it later today.
My apologies for those who would like to comment, but deplore registering with a blog site. Sounds like a good Digital Identity project- create a meta-registry for folks for blog comments, and do a ‘yes/no’ type lookup on the registry to retrieve data, or even to allow anonymous posting with a digital-ID link that can be looked up later IFF the comment is abusive (eg ad spam).
Relentless Inquiry 
The blogger.com users ‘raw food diet dude’ (http://www.blogger.com/profile/5780861) and ‘jaybee’ (http://www.blogger.com/profile/11483478) are comment spammers.
Their comments were removed.
Very interesting blog. BTW, doesn’t the word verification feature help with spam?