Forums and IRC channels specific to the domain you would like to work in. I have not done any myself, but I see people teaming up to make domain specific applic

Forums and IRC channels specific to the domain you would like to work in. I have not done any myself, but I see people teaming up to make domain specific applications quite often. For example, I am part of a tea channel on IRC. There are two people who have teamed up to make a tea journal app for Android.