The new Carnival of Mathematics is up and running at Modulo Errors. Highlights for me included:
Teaching Math
One opinion about when to introduce formal arithmetic (workbooky math) to children. What is the opportunity cost of too-early mathematics?
Criss-Cross Multiplication
An algorithm for two-digit multiplication that is easier for mental math.
Party For Polyglots
A brain teaser puzzle, not too difficult.
Coloring Knots
A topological doodling project.
Denise Gaskins' Let's Play Math 
Oops, sorry about the missing link; I was trying to link both the sites and the articles but mangled yours: it’s fixed now!