This positive article is from the site of the foremost UK financial newspaper, read by most of the 'city' workers every morning.

Extract of its concluding comments:
Although it is still early days, the latest version of Ubuntu looks like being a viable alternative to proprietary operating systems including Windows and OS X for a broader group of PC users.
Ubunto’s “Gutsy Gibbon” release may not be for everyone. But as I discovered, you do not need a PhD or an IT department to install it. Ubuntu 7.10 is worth considering if you are looking to minimise costs or join the open source movement.