The picture above shows Safari, Internet Explorer, Firefox and Windows panel within VMware Server and Gnome and Opera within Linux. Now it's simple. Thank you Apple.
My all machines are running Linux. Webdevelopment is easy as you have the same software on the machine as on the servers it will run on. I have full LAMP (Linux + Apache + MySQL + PHP), Eclipse for editing files, SMTP server and all that things under my fingers. According to my Windows experience it runs faster and more stable.