I know I can check this in my settings but maybe there are apps that use the lock screen that I haven't installed on my phone. I'm currently using Bing although it doesn't seem to update everyday like it should.
I think ESPN will be the first really useful one once it's updated.
Hopefully that update is soon, as the live wallpaper was pretty prominent in previews, and the live tile is non-functional.
The ESPN app from Nokia Collection is pretty good. It isn't limited to JUST one team like the regular Sportscenter app is. I got updates yesterday from the Cowboys-Redsksins game and the Napoli soccer team.
The only downside (with all those apps) is that it is limited to updating every 30 minutes or so. For example, the ESPN Nokia App is still reminding me that the Cowboys lost 38-31 yesterday...