Compete.com provides additional information that Google Analytics lack--your competitors' stats.
Would be nice if they have Google Finance's related news cross referencing feature but it's still pretty cool.
View the complete report to get to:
+ Visitors: people counts, ranks, visits
+ Engagement: attention, average stay, pages/visit
+ Growth: velocity
Here are some examples:
Google.com / Yahoo.com / MSN.com: (Complete report)
YouTube.com / MySpace.com / Facebook.com: (Complete report)
BBC.co.uk / NYTimes.com / WashingtonPost.com (Complete report)