Several weeks ago, Jen from life begins @ 30 posted some interesting statistics here on the most common screen resolutions in use today. She also offered some useful suggestions for how to see what your blog looks like in resolutions other than the one in which you normally work. A related question that I have been thinking about lately is how my blog appears to those accessing it through other browsers running in other operating systems. I recently came across a very useful tool for answering this question, one that I do not think has been discussed or mentioned on this site before (please forgive me if I somehow missed it).
The BrowserCam website allows you - normally for a fee - to see how any URL appears through any one of 65 different browser/operating-system combinations. The available operating system options include Macintosh OSX 10.3, Red Hat Linux 8.0, Windows 2000 Professional, Windows 98, and Windows XP; the browser options encompass all of the most popular ones (IE, Firefox, Mozilla, Opera, Netscape, Safari, Konqueror), and include certain older versions of these browsers as well. The site is far from perfect, but it is fairly intuitive; you simply type in the URL, check off the browser/operating-system combinations that you want to see, and specify the resolutions (640x480, 800x600, and/or 1024x768) in which you are interested. You then get thumbnail images of what the website at the pertinent URL looks like in each of the specified instances. There are other advanced services and features available as well.
The service is not cheap; it costs $19.95 for 24 hours of unlimited access, or $59.95 for a full month of unlimited access. Notably, however, BrowserCam will give you one free 24-hour trial period in which you are permitted up to 200 screen captures. I signed up for this earlier today, and I personally have found it extremely valuable. I was fascinated - and in some cases horrified - at how some people out there have been seeing my site, despite the fact that it looks perfectly normal on the computers to which I have immediate access.
So, after an iterative process of tweaking my template a bit and then running another screen capture, I was ultimately able to improve the percentage of browser/operating-system combinations in which my blog will appear at least more along the lines of what I intended.
I suspect that many of us are not hardcore enough to require ongoing access to this service; I certainly am not. But if you're just setting up your template, if you have recently made a substantial revision to your layout, or if you're simply curious to see how your site looks to your readers, you might find even a single session to be helpful. And given that the first session is free, there's really no downside.
P.S. Just to be clear, I have no affiliation with BrowserCam; I just found the tool to be quite helpful, so I thought I would pass along the information to the rest of you.