I have worked with Ubuntu Linux for about 2 months and find that Ubuntu is much better than Windows. My computer is Thinkpad T43 laptop. The reasons that Ubuntu is better are:
Wireless network supported. My laptop's wireless network card is Intel PRO/Wireless 2200BG. After booting from Ubuntu live CD, the wireless network is usable. Even you can install Ubuntu and surf the Internet at the same time. However, Windows XP doesn't support the wireless network adapter. So I have to download the driver from other computer and copy it to my laptop. Obviously, it is dirty work.
No need to look for software all over the world. Ubuntu, or any Debian-based Linux distribution, uses APT to manager the software packages. If you need to install some software, for example, apache2, you don't have to look for a download site but just execute "sudo apt-get install apache2". Ubuntu will download all necessary packages from its repositories. Installation and configuration are done by APT, the software package manager. If you don't know the package's name you want, you can use Synaptic Package Manager to find one. It is a GUI front-end of APT.
Perfect Chinese supported. Ubuntu 8.04 give me more beautiful Chinese fonts than 7.10. After installation, go to "System -> Administration -> Language Support" and check the Chinese option and the "Enable support to enter complex characters" option. Then you will get some Chinese fonts and input methods. It is extremely easy.
Anti-virus software is no need. When I used Windows, I have to install an anti-virus tool after installation. However, I think it isn't necessary for Linux. The viruses on Linux are much fewer than those on Windows. Since I don't install anti-virus software, my computer runs faster.
More useful softwares. After installation you can get many useful softwares. OpenOffice, GIMP, Pidgin... you can work immediately. However, on Windows, you have to install MS Office, GTalk or MSN Messenger... after Windows installation. Some people may not like so, they prefer to controlling their computer completely, so they don't like these softwares Ubuntu provides. No problem, just use "Applications -> Add/Remove..." to remove those you don't like.
Free and easy to use. Almost all the Linux distributions are free to use. Most softwares for Linux are also free. It makes people who are using Linux save lots of money. Besides, I think Ubuntu is easier to use than other Linux distributions, even Windows! No cost doesn't mean low-quality.