Where do you all get 35 GB from? An Intel MacBook has a larger harddisk than that (depending on model and version of MacBook. Mine has a 160 HB harddisk for instance). or do you mean the 35 GB is the amount of free space? That amount we don't know without knowing the actual size of the actual harddisk.
Discarding a laptop for work in Photoshop, as Ramón does, is as snobbish as always. There is nothing wrong with working in Photoshop (CS2, 3 or extended) on a laptop and/or on a MacBook, if you know the limitations and depending on which size of images you normally handle (most people do not handle multi-hundreds-of-megs images).
All our photographers at the daily newspaper where I work, work on MacBooks and/or MacBook Pros, daily, nightly, all the time. In Tiger though. Pre to MacBooks they used PB G4s for the same tasks. There is no requirement for a MacPro with 8 kernels and maxed out RAM to work in Photoshop. Period.
If somebody has a problem it CAN be lack of space and RAM, but it does not have to be. Particularly not with about 30 percent free harddisk space. There are plenty of other factors that can cause trouble. Leopard is one of them presently. Then the usual suspects like fonts, system-enhancers, bad RAM, other apps run at the same time and so on. And permissions and not installing as an admin user and activating as an admin user.