AI War Steam community hub
AI War Facebook page
Arcen Games' Facebook page
Tidalis Facebook page
A Valley Without Wind Facebook page
Our community forums
Report bugs and suggestions on MantisBT
AI War web IRC / irc.appliedirc.com / #aiwar
Arcen is the next featured on Humble Bundle's weekly sale, and it just started! Pay what you want for AI War and all its DLCs, AVWW1 and AVWW2, and Tidalis. Beat $5.80 USD for Shattered Haven and Skyward Collapse. Both options include their games' soundtracks, all done by Pablo Vega. Keys from the bundle can be used DRM-free standalone, or input into Steam if you pay $1 or more.
All the info and page to order here.
The Summer 2013 AI War Sortie Bulletin topic at the community hub is a place to find other players.