The linuxcnc forum is pretty active as is this forum. The thing to remember is that not too many developers frequent the forums. They prefer IRC. So if you get stuck and need a little guidenc - IRC is your best bet. They are not going to hand hold you though - they expect some effort/research on your part.
You can use a web based one here
As far as prime time? You bet! It will control anything from a small stepper machine to a large industrial machining center.
What have you tried so far?