In addition to the usually friendly, usually correct, and usually prompt advice you get here are the ioio-user group, here are some places for ioio users to find information.
Start with the Wiki. It has critical information about the hardware, as well as descriptions of the different features of the IOIO.
https://github.com/ytai/ioio/wikiBeginner Tutorials:http://www.sparkfun.com/tutorials/280http://www.jayconsystems.com/tutorial/ioiobeg/IOIO Book: "Making Android Accessories with IOIO" by Simon Monk.
"The book is very well-written. First, the choice of projects is very
well thought out: starting with simple ones and moving on to more
complicated ones. The projects also make good use of the fact that an
Android phone is part of the setup and can be used for user interface,
sensors, connectivity, etc. Second, the projects are very well
documented and explained. It is very clear that the author understands
the technology really well and finds the right way to transfer this
understanding to the reader." -- Ytai
https://www.sparkfun.com/products/11135kindle:
http://amzn.com/B007C5TUE8Java Help:All:
http://www.oracle.com/technetwork/java/javase/documentation/index.htmlTutorials:
http://www.oracle.com/technetwork/java/javase/documentation/tutorials-jsp-138802.htmlAndroid Help:All:
http://developer.android.com/develop/index.htmlTutorials:
http://developer.android.com/training/index.htmlElectronic Help:Google is your friend :). Here are some other good places for specific tutorials. There are a lot of tutorials and guides for arduino, and usually you can learn enough from those to use with IOIO.
Tutorials:
http://www.sparkfun.com/tutorialshttp://www.adafruit.com/tutorialshttp://www.jayconsystems.com/tutorialFirmware Development Help:
Firmware development isn't needed, most of the time. If you want to learn about it, join the ioio-dev group.
https://groups.google.com/forum/?pli=1#!forum/ioio-dev