I appreciate the perspective and responses to this thread so far. Didn't realize it would generate as much negativity as it has!
Please rest assured, my son doesn't spend most of his free time inside/on a computer. His preschool is actually a well-balanced environment that has them outside for a good part of the day, weather permitting, and almost all of his activities involve learning and interaction with other kids/teachers.
Why do so many people assume the extreme -- that the kid is gonna be plopped in front of a computer and spend all of his free time there?
He plays with legos, rides a trike, climbs the hell out of a playscape, kicks a soccer ball, plays catch, doesn't suck down sugar and fatty crap, and likes being with other kids. There seem to be basic things he can do on a computer -- lego games, basic math interactive programs, some basic video, that can augment hand eye coordination, get him used to a mouse, and at least give him a passing familiarity with a computer.
Why this automatically translates into, "what kind of a parent is this guy who can't even teach his kid how to be a kid, and will have him looking at internet porn by 7" I have no idea.
Frankly, I choose a laptop over a desktop due to space limitations and to condense the package, so to speak.
So the bottom line, a kid can be a kid just fine and learn a little about computers at the same time. My question was about appropriate technology in an age range, not about how YOU can or cannot raise your own kids.