D for competitive programming

[sarn via Digitalmars-d]

To add to the list, here are a couple of other online judges that 
explicitly support D:

http://www.spoj.com/
http://judge.u-aizu.ac.jp/onlinejudge/

Of course, if you use a language-agnostic platform like Code Jam, 
you can do what you like.  Project Euler (maths-oriented) and the 
Matasano Challenges (crypto-oriented) are two of my favourite 
problem sets.