I never ventured into the Coding Competitions forum before but was quite surprised to find that when I went into it for the first time today the most recent post in there is from 2007! So how come there are no competitions anymore?
I think it would be cool to do them and I'm sure lots of people would learn a lot from trying creating entries for them. If you do decide to start them up again it might be good to make them not too difficult so that quite a few people can enter

Cheers
Chris