Depends on where you are...but there is a magazine called Business Traveller that publishes articles related to comforts on sitting in coach.

Singapore Airlines seat pitch is measley at 32 inches. BA is just as bad at 31 inches (sorry don't know the metric conversions).

Airlines that have great seat pitch on their long haul are :
Swissiar 33"
Finnair 33"
Malaysia Airlines 34"
Canadian Airlines 34"
Thai Airways 34"
Ansett Australia 35"

Most of the other carriers are about 30-32"