Tablet PCs are the way to go for general use (NOT games). Be they palm-sized or laptop-sized, they rock.
A pen is just SO MUCH BETTER than a mouse (unless you're gaming).
OK, so if the tablet doesn't have a keyboard it can be a bugger to type up a document, but the device I have my eye on comes with a nice compact keyboard and stand attached to the back. Sets up like a laptop in seconds, if necessary.
I've been using this particular tablet for a couple of weeks now. The company uses it for testing applications, but it's kinda old and they're selling it soon. So I'm going to buy it.
It's not very fast (only about 1GHz, I think) but it does have a gig of memory... I might remove half of that and sell it on.
Now... does Debian have native support for tablet pens? I assume so, since the device looks like a mouse to the OS, but Windows XP Pro doesn't detect it for some reason.
For gaming, desktop machines are and always will be superior to laptops. They're much cheaper for the same power, and there's usually a delay of between six and twelve months between new tech arriving for the desktop and the same tech becoming available for lappies. Besides, replacing your laptop's graphics card is an awkward task.