Math Cats celebrates its 9th birthday with a new photo of the week. http://mathcats.com/realcats/scene23.html

Oops! Here's the correct link for great geometric constructions (at William's Home Page): http://www.cyffredin.co.uk/

great geometric constructions at http://cyffredin.co.uk/

At the brand new Calculation Nation - http://calculationnation.nctm.org - you can challenge other online math game players.

Meow! NCTM Annual Meeting is Apr 22-25 in DC. I wrote about it here (with links to the program & more): http://tinyurl.com/mathchat-nctm

Lots of winter math ideas and links here: http://tinyurl.com/wintermath - I love the snowflake photographs and snowflake-making applets.