I was talking to your Aunt Ginny about it the other night, as it happens.
I'd have to do some study on the subject, which may or may not be completely easy as I don't have access to all the magical books at my disposal in our world. However, thankfully Quidditch Through the Ages IS published here, and maybe it can give me some insights into what's needed to make a broom a BROOM instead of just a stick that sweeps.