Netbooks
Actually, my Aspire One netbook (running Linux, it has to be said) has helped out at the office on several occasions precisely because it is small and easy to carry and, on more than one occasion, because it was running Linux and not Windows. Recently I've been using it as a Linux development platform, although I have to admit to cheating by running an X server on my Windows desktop machine and using SSH to the netbook.
Microsoft killed the true netbook anyway - the Eee and the AA1 and their early competition. All of a sudden the screen size went back up to the point where it's a small laptop, not a netbook, and it's hard to get a low-end cheap, small machine now (although I just bought a spare AA1 on eBay). That's one of the reasons to dislike Microsoft, although it's not completely their fault.