Objective Development Forums

I would like to know which ATmegas work out of the box with VUSB.

The reason I ask is that I have been trying to get VUSB running on a ATmega644 20PU for about 3 weeks with no luck. I am going to order another ATmega from digikey. I would prefer to order one that has known success.

Thanks.

I see no reason why Atmega644 shouldn't work though i've not tried one myself I have had success with the mega48/88/168 range. You will need to use the zener diode level shift (as opposed to the series diode voltage drop method) so i'd order up a selection of 3.6V < 500mW zeners while you're at it.
I would also recommend you start with one of the stock examples that ship with the driver then move on to more advanced projects once you are sure you have the hardware setup correctly. Another option would be to build a usbasp as it works great and is very well documented.