I have not tried this, but I want to. Just saw this today:
http://delicioustv.com /2007/05/pumpkin-and-bulgur-chili/ (broken link)
It looked really yummy. sugar pumpkins should be easy to find this time of year and inexpensive, but I'm also guessing plain pumpkin puree would work.
I'd substitute the bulgur with rice or barley because I don't use bulgur but if you do and have it on hand...sound good.