I'm in a different boat, my last 3 machines have been notebooks and I'm actually going back to a desktop.
Then again, my needs (3D modelling + animation) are a little different than most and the subsurfacing can be intensive on a notebook (especially when you want framerates to be as close to realtime so that you can judge timing effectively)
There's also other reasons why it's useful, More RAM, more raw CPU power - but obviously I'm on the other end of the scale... the people who need that extra oomph
Then again, my needs (3D modelling + animation) are a little different than most and the subsurfacing can be intensive on a notebook (especially when you want framerates to be as close to realtime so that you can judge timing effectively)
There's also other reasons why it's useful, More RAM, more raw CPU power - but obviously I'm on the other end of the scale... the people who need that extra oomph