Dare Obasanjo points to yet another case of spammers abusing the commons - Blogspot has gone to spam heck, and the various tagging schemes (Technorati, de.icio.us) are being abused:

A very high percentage of the spam blogs that we process at PubSub.com also come from blogspot. We’ve got more serious “problems” in Japan and China, however, for the English language, blogspot is pretty much “spamspot.” It is, as always, disappointing to see people abuse a good and free service like that offered by Google/Blogspot in such a way.

And then there's:

All Blogspot blogs right now are included in every Feedster search by default. And now, due to the massive problems with spam on Blogspot, we're actually at the point of saying "Why don't we make searching Blogspot optional for all Feedster users". What's going on is that spammers have learned how to massively exploit Blogspot -- to the point where at times 90% of the blog traffic we get from Blogspot is spam. Now that's bad. Actually this spam issue just plain sucks. And its starting to ruin the user experience that people have with Feedster.

If Blogspot supported categories, Dare's right - things would be even worse. Here's a question I have - what's Microsoft doing to combat this with Spaces? I can see where combatting spam blogs would be pretty hard with a free service. IMHO, this falls back to a very old adage: You get what you pay for. If the service is free, you pay one way or another...