Say... You want to buy one of these notebooks, and don't want to pay for XP. Ticking the Unbuntu tick box saves 40-50$ (just double-checked vs. the dell site). You then install XP yourself. I'm sure drivers are available from the Dell website (or pherpas even come as a kit). Dell doesn't have a "no-OS" (barebones) option.
I'm an avid Linux user (writting this post on a Hardy Heron Ubuntu, actually). However, I'm also realistic.
On the other hand, there's nothing wrong with copying bits. Laying ownership to a sequence of bits is just plain silly.
Just my 2 bits. As a user of Linux in a software/algorithm context, my personal beefs with ext3 / the current kernel line are:
1) IO priority isn't linked to to process priority, or at least, not in a decent manner. it is all too easy to lock up the system with one process that is IO heavy (or a multiple of these) -- hurting even high priority processes. As the IO call is handled by a system level (handling buffering, etc.) -- it garners a relatively high priority (possibly falling under the RT scheduler) and as a result IO heavy processes can choke other processes.
2) ext3+nfs simply sucks with very large amount of files. I used to routinely have directories with 500,000 files (very easy to reach such amounts with a cartesian multiplication of options). The result is simply downright appalling performance.
My computer can beat up your computer. - Karl Lehenbauer