I would like to see more sensors:

Barometric Pressure/Temperature/Altitude Sensor
Luminosity/Lux/Light Sensor
RGB Color Sensor

Or can I use TinyDuino with these:
http://www.adafruit.com/products/1603
https://www.adafruit.com/products/439
http://www.adafruit.com/products/1334

I want make a tiny exposure meter and barometer for forecast weather, and color sensor to measure color temperature.

And is it easy to add infrared emitter?

We do have a light sensor available under the sensor category, and a new BMP280 based pressure sensor will be up on the website soon.

We tried a color sensor, but it doesn't work well in our format- the setup needs to be tailored to the application, so it's better to build in a breakout like the Adafruit board. We've thought about some sort of remote board setup, but haven't gotten to it yet.

It's definitely easy to solder an IR LED to our proto board.