There are literally hundreds of millions of blogs in the “blogosphere.” That said, I read a post at Caslon Analytics that provides some (outdated) data indicating that %60-%80 of all blogs founded go dormant, never to reawaken, after about a month. That’s the way it works I guess. I tried to get some more recent information from Technorati, but alas, that site is blocked from within the district.

There are some blogs I do consider worth reading. Hopefully, they will not go dormant. Here are some (give them a shot):

Deb’s Mathematics Blog

Not a typical opinion-oriented blog, but since it’s a part of About.com it does get updated regularly. Deb often posts some useful worksheets.

Mr. Teacher

Mr. Teacher’s blog supports his website Mister Teacher. He’s a 5th grade teacher so most of the stuff is at an introductory level, but that is exactly what a some kids need. He has a lot of mini-movies which are Flash-based and play very well over the web or from within a Smart Board application.

Thami’s Math Blog

This teacher does a good job of telling the rest of us what works and what doesn’t in her classroom. It’s been updated fairly frequently so far in 2009.