Shows how online services from Microsoft and Sony stack up against each other.
The only thing that XBL is missing is an integrated browser. I think they dropped the ball on that one, but it's not a deal-breaker.
What worries me about PS3's network is that it's the responsibility of each game developer to maintain their own online servers and capabilities for their online games (at least that's how it's been explained to me). I'd be worried that once a studio release a new game, or a sequel to a title, that online support for their previous title would wax and wane until it was virtually unplayable online anymore.
Time will tell, but Sony definitely has an uphill battle ahead of them in the online-gaming space.