In the past seven weeks, my WinXP laptop has died four times. My Ubuntu laptop has barely had a hiccup. I've been more productive on the Ubuntu system than I have ever been on WinXP. Excellent.
At this point I am 99% Open Source. Ubuntu, OpenOffice2, Firefox, Thunderbird, Sunbird, Eclipse, Apache, Tomcat, Geronimo, Ruby, PHP, MySQL, Derby, GAIM, IBM Community Tools (IBM internal open source project), etc. The only non-Open Source tools I'm using are limited to Lotus Notes, Rational Application Developer, DB2 and WebSphere.