Good question; I'll be interested in the answers.
I'm a landscape fotografer. I just don't shoot people*, urban scenes, rodeos, parades, auto races, etc., so I need to get away for my work. I do several several-day trips per year and perhaps several more one-day trips per year. I shoot digitally (a Canon EOS 1Ds) and bring home maybe 50 frames per day. I believe in culling images--I've been shooting since April 2000, have ALL my images (even the odds'n'ends) on my computer's 140GB HD system** and it's not full, and have just over 50 pics in my portfolio.
* One of my goodbuddyfellowfotogs says 'if it has a pulse, I don't shoot it'. I've adopted that.
** Seems this is relatively rare. The other digital fotogs I know have at least one and usually more LARGE, external HDs they use to store their image files. One of those guys shoots a lot, culls virtually nothing, and still has ALL the images he's ever shot. Soon he'll be running out of desk space, or maybe power outlets, or maybe FireWire ports, for all those HDs!