Look through the Gluten Free Brewing thread and you'll likely find some recipes in the posts. I've yet to taste mine but if it's good I'll post it. You can also check the Gluten-Free Brewers group, I am almost positive there are some recipes there.
As for buying malted sorghum- we're all trying to figure that out, for now I am going to take a stab at malting my own.
Lucky 13 Brewing Company