All user documentation is on the Wiki.
You can get answers to questions and get news about IOIO on the ioio-users discussion group.
The IOIO Gallery lists various IOIO projects to give you some ideas of what you can do with IOIO.
And this is the blog of Ytai, the inventor of IOIO, where new developments are normally announced. Specifically, this introductory post provides a good overview of this technology.
You can purchase a IOIO-OTG board online from:
- SeeedStudio (primary manufacturer - manufacturing, testing and service standards have been inspected).
- Sparkfun Electronics (primary manufacturer - manufacturing, testing and service standards have been inspected).
- Jaycon Systems.
- LinkSprite.
- CuteDigi.
- AliExpress.