I'm with you for the most part, [MENTION=111144]Andy_K[/MENTION]. A 50/34 crankset feels like a triple with the middle ring (the most useful, IMO) removed. It seems like you need a wide-range cassette to avoid constantly cross-chaining or shifting the front.
That said, I'm experimenting with a 48/34 crank on my long-distance bike. The cassette is a 13-24, but if the setup ends up with me shifting the front too much, I'll be willing to try a 13-26 cassette before saying "the hell with it."