BioDiesel for non-hobbiests
My dad sent me think link today. Groovy. Expensive, but groovy. Don't know how good it is, but the description seems to suggest they know what they're doing. Acid/base pH balancing, 3 stage water wash, 110V @ 15A power suggests a drying stage.
If you're a boating marina selling fuel or farmer that wants to go with green fuel without modifying your vehicle - this looks like the fastest route. At $9,000 USD you better be prepared to make about 10000L of BioDiesel before this thing breaks even.
Note: you can use BioDiesel in an oil furnace too, so 10,000L may not take too long for some of you.