Canabalt is an amazingly simple yet fun game to play, but that simplicity results in some terrible UI issues. The only interaction you have in the game is to touch the screen to jump. If you die, touching the screen restarts the game and you're running for your life again, but the result is that there's no way to see high scores without restarting the app.
Another issue is that you have to 'click' on the screen to jump. Many iPhone games share this issue, but since the game is a fast scrolling game, every last pixel of the screen is precious. Hovering your big fat thumb over the screen so you can jump is either a nasty side effect of the iPhone's interface, or an added difficulty bonus (ie, it's not a bug, it's a feature!). To me, it's an unfortunate side effect.
Also, I find the ease of posting to Twitter compared to the difficulty of seeing your high scores to be a funny little commentary on the game.
There's also no online leader board, so I have no idea if this 7k run is good or not. But I's only $2.99 and is a great distraction during commercials or when recovering from yet another wipe on heroic 25 man Anub'arak. You can play it online for free.