I have written an article on getting started with Pebble apps development at MobiForge.com.
Here is an abstract of the article:
"Pebble is a smartwatch developed by Pebble Technology Corporation. It is one of the most successful Kickstarter projects to-date and has received significant successes with consumers. The Pebble watch itself comes with a black-and-white e-paper display, and includes several sensors such as magnetometer, ambient light sensor, and an accelerometer."
Read the article here.