With rolling hills I try to build up as much momentum as possible on the way down and I normally end up in a 53/11 or 53/12 combo. On the way up the next hill I'll work my way up the cassette (9 speed) until I'm out of that range of usefulness (not sure what cog that is, but it's before being cross chained too much), then go to the 39 ring and shift down twice on the cassette, then work my way back up the cassette again. I'll stand before things get to hard to keep up the momentum. On long climbs, I'll end up alternating between spinning and standing.