Hello, I have started using your Teensy++ now, I had to go back to 8 bit to learn C. I support your products/designs and would like to know if it is possible to upgrade the ++ for more functionality. It wouldn't be that hard would it to add the following:

1. A Micro SD Card Slot
2. Go ahead and add a RTC Crystal and Caps.
3. If possible even a header for Battery Backup.

I have purchased two AT90USB1286 with the above features already added, but I would rather buy from PJRC instead. I think this chip is amazing for 8 bit projects and has been over looked by other people. This chip also has ability to access 64k external SRAM if added. I believe you would broaden the market if you added the features, I know I would buy several more.