If they are outside, I would definitely bring them in. Personally I would bring them in 'on the vine' and lay out in a single layer to ripen. If you particularly want them to ripen quickly you could put a ripe banana in with them, otherwise, in my experience they'll get there in the end without.
I still have toms in the greenhouse (various sorts), and whilst I've cut them back considerably (and picked some green ones for Earthbabes chutney!) I am planning on leaving them a while longer to ripen at will. However, I've been shutting the greenhouse door at night for a couple of weeks now - just to keep the temperature up a bit to help them ripen, and also, as time goes on, in prep for the frosts (although I'm in the south so I'm probably fairly safe).
As well as the banana method, you can also place them near cut flowers. The down side to this though is that they may well turn your flowers much quicker!!