Written in Jan 2002, but things could only have improved since then.
http://desktoplinux.com/articles/AT9664091996.html
This is yet another in the recent stream of "Linux on the Desktop -- can it work?" style articles. The difference with this one is it's not just speculation: it's the account of a company's recent shift to open source on the desktop -- which has been a resounding success. Today, TrustCommerce employees run almost exclusively open source software on their desktops.