The advent of Vista has caused me to begin exploring other options. For me, as the expense of Mac is not in my budget, I am exploring Linux.
My experience with several versions of Linux has been excellent. I have 'played' in Fedora, Ubuntu 7.10, and Mint. I have installed Ubuntu to my primary desktop (which I built myself 3 or so years ago) and will keep it. I started with Fedora on an older HP Pavilion laptop. I moved recently from Fedora to Mint on it. All 3 install easily to my existing hardware. All 3 automatically identified and installed my hardware. I had no configuration problems.
I did not care for Fedora - it seemed 'clunky' to me and seems more difficult to use in relation to proprietary formats.
I am quite happy with Ubuntu 7.10. As yet my only problem with Ubuntu involves watching and hearing youtube videos. I can't get sound because the available flash plugin needs some work (or so my research tells me). The only other thing that bugs me re: Ubuntu is related to my having to learn a new way of doing things. As yet I can find no way beyond using the command line to get all the buttons on my 5 button Intellimouse working properly. And the keyboard configuration options for my specialty keyboard don't make a lot of sense to me as yet. So none of the specialty buttons on my keyboard are configured yet.
If you don't want to be bothered downloading and burning your own install disks, below is a link to OS Disc. Also, Distrowatch is a good place to go for info re: the various distributions and what is included in those packages.
http://www.osdisc.com/cgi-bin/view.cgi/index.html
http://distrowatch.com/
I have been using OpenOffice for about 3 years now and it is as much as I need for what I do. It is compatible with MS Office document file formats, and can be configured to save in those formats. I work back and forth between MS Office and OpenOffice with ease. Thunderbird is my mail client of choice, though Outlook it ain't (and neither is Evolution). I use Firefox and Epiphany for web browsers and have no issues.
I have been experimenting with a virtual machine on Ubuntu using Virtual Box which is part of the Ubuntu package. XP is up and running in that virtual machine, but due to motherboard and ram issues I cannot do what I need to do with it. Not a Linux issue.
All in all, if you are fed up with MS, give Linux a shot. No real probs here at all.
edit to add: latecomer to the PC scene and 50+ in age.
edit again to add: As rahouseholder has noted below, try out a few Live CD's. Most Linux offerings now come as both LiveCD's and install CD's. I began my migration by exploring Linux using Live CD's.
edit yet again to add: OpenOffice came with Fedora, Mint and Ubuntu.