Uses for Sawdust?

[cdig]

I just found a source of FREE sawdust in massive quantity (5 tonne truck load/month, continuous supply). Anyone know of a way to easily turn this material into a heat fuel? Or some other use to save money?

I was initially looking to get a small amount for cleaning up spills on the garage floor, but this just strikes me as an opportunity for something far bigger! Did I mention it's FREE?!