This blog has a really interesting assortment of articles on mathematics and programming. You can use the tags to your right to find topics that interest you, or you may want to have a look at
You can also subscribe to the blog newsletter.
I have always loved solving mazes... so naturally I had to write a program to solve mazes for me!
Check out codegolf.stackexchange.com if you want to solve programming puzzles, but with a twist.