W3C Markup Validation Service is the most popular blog (?!) on Technorati
http://technorati.com/pop/blogs/

No 2 a free web counter.

Because of the design? Some designers put "validate html" on the bottom of the page.

There's a lot going wrong with Technorati top 100 right now. There's mostly counters and blog platforms in the top 20 now :)

Yea, some bozo named Google Blogoscoped is #30 in the Technorati top 100 ... ;-)

"By the way, you may notice that the Top 100 may jump around a little this week, or that some non-blogs (or blog hosting tools) may occasionally sneak in for a short time – we're doing some maintenance on that code, and I apologize in advance if you see anything wonky"

via: Sifry's alert

http://www.sifry.com/alerts/archives/000434.html