For those of you who want full control over the software you are using, we are releasing an open source firmware for FEZ. We are calling it "FEZopen." Not only that, we are including a free ebook on porting NETMF. The book uses the $19.95 FEZ Panda to demonstrate porting NETMF but you can use any FEZ. Make sure to order your FEZ Panda soon.
The open source driver, FEZopen, includes UART, SPI, I2C, timers, threading and many more drivers making it complete for your deep customization and exciting projects.
Want to make your own hardware? We have EAGLE design files available online for every FEZ, feel free to make your own and load the FEZopen firmware on it.
The original propitiatory firmware still ships free on all FEZ products. It is up to the user whether he wants to keep the USBizi firmware or switch to FEZopen. Using the priority firmware allows us to have better version control and support for our commercial customers.
The new book and FEZopen firmware are still in development but they get you far enough in porting. Since this is all open source, we look forward to your contributions as well. Please visit the TinyCLR download page http://www.tinyclr.com/dl/