Don't know if this is helpful to anyone.
I was looking into browser usage across some sites I manage.

The stats are based on 15 sites of various sizes, largest 40,000+ visitors to smallest 600 visitors a month. The stats are from October.

Total number of visitors 95,000+ across the 15 sites.

Breakdown of browsers:
IE: 76.89%
FF: 17.12%
Safari: 4.22%
Chrome: 0.91%
Opera: 0.49%
Rest: 0.37%

Breakdown of IE versions as % of overall IE users:
IE8: 0.6%
IE7: 69.31%
IE6: 29.79%
IE5: 0.3%

Breakdown of FF versions as % of overall FF users:
FF3: 75.89%
FF2 : 23.13%
FF1.5: 0.84%
FF1: 0.14%

Any demographics on these users?

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They would be an average cross section of a local community, largely be made up of a non-technical audience.

The sites are informational based rather than forums, blogs etc. Small sites running local news, events and community based announcements. The larger sites would be a national versions of the small sites.

Age groups vary across the sites from kids to 80/90 year olds, but from what data I have gathered in the form of direct feedback the bulk would be 40-60 year olds. I would also infer that the 20-39 year olds are not a large demographic in these stats.

I don't have an exact geographic breakdown on these figures but roughly speaking:
70% Ireland
10% England
10% USA
10% Rest of the World

I pulled up stats earlier for another post and they were pretty much similar. I noticed IE is only 70% for the US sites I SEO. What about screen sizes - its pretty good to show those - how many sites are still designed for 800x600. I noticed that we have more visitors with 1440 screens than 800x600+everything else below 1024z768

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I didn't pull stats this time for screen sizes, I did a quick review a couple of weeks ago, and very few were using 800x600. Any sites I work on I usually go for 960px as standard.

One other interesting stat that may be of use. I ran a live streaming site up until recently, I changed over from streaming wmv to flash. One worry I had was not everyone was using the latest version of flash which was required for h.264 streaming.
At the time the site had 10,000+ unique users a month I thought there would be plenty of issues and support requests to upgrade, but using swfobject - Google Code 98% had upgraded to the latest version of flash in a couple of days. It was one of least painful things I have ever done on the web

This is interesting.