The following links lead to the most recent documentation. Because of that it is recommended that you update to the latest version of Pika.

Programming Guide
Pika-Programming-Guide-0.12.0.html coming soon
This is a good place to start if you want to learn how to program in Pika.
Documentation coming soon
The documentation is currently being compiled. The first draft will be release in the next 1-2 months.
Pika Language Wiki
Contains tutorials and guides relating to Pika. Currently a few versions behind.
Build Guide
Guide on building the code base using CMake. Now located on the Pika Language wiki
You need to create a free SourceForge account in order to post there. I will try and answer any questions posted there ASAP.
Mailing List coming soon
A mailing list will be created sometime in the future. If enough users ask for it I will create it sooner.