How can you send email to a Gmail Contact Group?
I spent some time checking for a solution myself, and here are my conclusions.


We will never be able to send to groups within Gmail for Android. I think it's a problem Google will never solve maybe because they want us to use Google Plus to send to groups (i.e. Circles).
To send to Gmail groups outside of Gmail, I found that using Go Contacts is the best way. Gmail Group Share (Free) is also working, but it shows groups of only one Google Account at time.