Now that the controller can do I2C similar to the NXT, I would like to see drivers on the cRio for all Lego NXT sensor products.
Mindsensors -
http://www.mindsensors.com/
Hitechnic -
http://www.hitechnic.com/
In terms of interfaces, here is my priority list,
1. I2C
2. Serial Ports
3. Quadrature Encoders
4. Analog
5. SPI
Eventually having more interfaces for SparkFun's huge product line would be nice as well,
http://www.sparkfun.com/commerce/cat...hp?cPath=23_85 an IMU would make life so much easier