Easy….multitask.  From 37 Signals…

I’m not complaining, I’m just observing. And the primary observation that comes out of all this is that multitasking is the fastest way to mediocrity. Things suck when you don’t give them your full attention.

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This isn’t a breakthrough, it’s just a reminder. If you want to do great work, focus on one thing at a time. Finish it and move on to the next thing. It means some things aren’t going to get done as fast as some people may want. It means some people aren’t going to get your full attention for a while. But doing a bunch of crappy work, or making a bunch of poorly considered decisions just to get through the pile isn’t worth it.  (Source)