Windows 7	Ubuntu 8.04
Can send or receive email.	No	Yes
Can open common "office" files (documents, spreadsheets, presentations, etc)	No	Yes
Can burn music CDs.	No	Yes
Can burn data CDs.	Sometimes	Yes
Can burn DVDs.	No	Yes
Can organise photos.	No	Yes
Can retouch images.	No	Yes
Can play a DVD.	Sometimes	Yes
Can view or create a PDF.	No	Yes
Tens of thousands of free applications available.	No	Yes
Tens of thousands of viruses, trojans, and spyware available.	Yes	No
Can back up all files and preferences.	No	Yes
Customisable user interface.	Guess you can change the wallpaper...	Yes
Can have multiple people logged in simultaneously.	No	Yes
Has virtual desktops.	No	Yes
Updates for the system and applications.	System only	Yes
Can be supported by:	Microsoft, and Microsoft only	Dozens of corporate entities, or community forums, or hire someone, or DIY
Slows down over time.	Yes	No
Reboots your computer without asking.	Yes	No
Price	$400.	Absolutely free.