Quantcast continues to get better and better. They are really going to give Alexa a run for their money. The methodology is stronger on Quantcast because they qualify publishers and they don't just rely on a silly toolbar. They work with advertisers, publishers, ISPs and advertising networks to get hard data on millions of Web sites.
The gang at Quantcast has added added a bunch of new goodies, including comparative charting, traffic trends and siteographics that tell you what similar sites people in their panel are visiting. I bet they're not only going to give Alexa trouble, but I also think that folks like Nielsen and comScore should be nervous. This is powerful stuff and I find I am tapping into their site almost on a daily basis.
Here's a screenshot from Quantcast showing some stats on Daily Kos...
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