I probably grill more on my cast iron grill/griddle reverser lately. I've got a good ventilation hood indoors and it does an OK job. I've been enjoying this cast iron grate on the gas stove I picked up at a Hispanic market. i got to looking after seeing Rick Bayless use one on his show. Great for roasting peppers, onions, garlic and such.
Raichlen's also written a handy book on indoor grilling which I have too.
But I have to confess my gas grill is in dire need of new burners and cooking grate. Ed Buchanan gave me a link, probably two years ago for parts and I've not gotten around to fixing it yet. If my smoker were to have died, then I'd have replaced it pronto, and probably the grill too.