Mac vs. PC on Web 2.0 Websites

Does anyone have market research on the percentage of viewers on Mac across Web 2.0 websites? The average number going around, for all sites, is about 5%. But this includes the sites that we all browse everyday at work. Look around you, even as a Mac user, your office is likely full of Windows boxes.
A friend at beYOU.tv explained this theory to me the other day. That the types of websites we visit at work and at home are fundamentally different and that the market share of Mac to PC in those locations is also fundamentally different.
Meaning, Web 2.0 sites, like video sharing sites, are likely to have a higher percentage of views from Mac users than, say, The New York Times website.
The graph above shows the percentages on this site for the previous month. Not that I'm implying this is a Web 2.0 site, but 26% is a hell of a lot higher than 5%.


