Jackson,
No matter what career your kids head towards
they will no doubt need computer skills. It
seems that computers are becoming part of
everyday life.
As suggested I think its best to let them play
but ONLY for a limited amount of time on computers.
BTW, I have been looking for entry level
programming software for a friend's kid. Some time
ago I found http://www.alice.org quite good but I have now
also located http://scratch.mit.edu/. The latter is like
playing with building blocks to produce simple
programs, great fun, even for adults 
I think SketchUp may be a bit on the techie
side for kids starting out. Maybe you should
have a look at MagicalSketch 2 by http://www.e-frontier.com/article/articleview/1204/1/553?sbss=553
MagicalSketch may look childish but some
amazing stuff can be produced. This program
coupled with Scratch should be able to produce
the kind of stuff kids are into these days.
Mike
PS: Must get rid of that squirrel .... getting a
pain in the head 




