I'm with Demaestro and think that dial-up users are closer to 10%, if that.
I agree. The 1/3 not on broadband doesn't necessarily mean they're struggling with dial-up.
Plus, so many people use high-speed web access at work, but not at home... (especially busy parents who often don't find the time to surf the web in the evenings/nights). Others don't have computers, but use smartphones and access the Internet via Edge or 3G.