DS walked over when I was setting myself up for torture in NaNoWriMo. He asked about it and I explained the idea. He decided that he wanted to participate with me!
We made him a word count of 1000. On the very first day of writing, he posted 118 words! This from a kid who hates to write. He's writing a play involving superheros and monsters. NaNo will send him a certificate for participating and if he completes his goal, he'll receive additional stuff. I can't believe how excited he is about this! I'll keep you posted...
Do we have the same child at home? DS7 too decided to participate much to my surprise given his attitude towards writing. It might have helped that the all the children in the class he attends couple of times per week participate.
His goal is 1,000 as well, which is way too low but whatever makes him happy

He wrote 190 words yesterday and about 100 more today.
Have you done the preparation booklet?
http://ywp.nanowrimo.org/workbooksIt's quite awesome. It makes one really thing about all the characters, setting, story line, etc.