Watch out for some dual boot snags
It should be noted that the Windows OS installers are quite "Linux hostile":
* They don't know about GRUB boot loaders and will wipe off any GRUB loader installed on the MBR of a drive (which is where most Linux distros put it by default). This will happen if you need to re-install Windows on the same drive that you installed Linux on. You're then going to have to hack your way through re-installing grub via the live Ubuntu CD and some estoric command-line work (believe you, I've had to do it more than once).
* Bizarrely, although XP and Vista beta/RC's Windows installers are happy to format any existing partition on a drive, Vista final and *all* Windows 7 (including RC's) releases will *not* format a partition unless it's unformatted or has FAT32 or NTFS on it. So don't use the Windows installer to re-install Windows (Vista or 7) on an ext3 or ext4 partition if you give up on Ubuntu.
* I've found that some Windows installers insist that the first partition of the drive you'll be installing Windows on has to be NTFS. Very stupid behaviour - especially if you've already put Linux on the first partition! - and may be fixed by the Windows 7 installer though.
Also, be careful about mixing the latest Ubuntu (10.04 - uses GRUB 2) with another distro (e.g. Fedora 13 - uses GRUB 1) on the same drive - it'll make juggling menu.lst (aka grub.conf) entries "interesting"! I solved it by using Fedora's GRUB 1 as my preferred grub and cutting/pasting lines from Ubuntu's GRUB 2 entries into the Fedora grub.conf (yes, I have to do this every time I update Ubuntu's kernel).
If you do dual boot, *always* keep a live Linux CD handy for fixing grub issues (or for just re-partitioning via something like gparted) - get used to typing "grub" in a console, then "root" and "setup" commands inside grub.
BTW, the advice about not burning a CD image onto a DVD isn't great - that probably applies to ancient BIOS'es and CD/DVD drives. Where possible, burn a CD image onto a blank DVD because a) it's faster to burn, b) it's faster to load and c) blank DVDs cost the same as blank CDs, so you do *not* save money by using a CD. In fact, anyone burning data CDs nowadays should go out and buy a DVD burner and some blank DVDs right now, because you'll not twiddle your thumbs waiting for CDs to burn or load.
Oh and if you have a 64-bit CPU and 4GB+ RAM, as the article says, you should install the 64-bit version of a Linux distro. It can give you a 5-10% performance improvement and you can install 32-bit libraries easily should you need to run any 32-bit apps. There was a 64-bit version of Flash, but the morons at Adobe have abandoned development of it, just as Mozilla announce that they will be doing official 64-bit builds of Firefox in the future (and 64-bit distros already ship 64-bit Firefox anyway!).