This is an innovative - and scientifically supported - app/website that gives you just enough ambient sound to spark your creativity! It is a steady stream of just the right volume and type of sound to replicate a coffee shop atmosphere. The science behind it suggests that creative, abstract processing occurs most often in a moderate sound atmosphere (around 70 decibels) versus low (50 db) or high (85 db).
You can download the app for Mac, iPad, or iPhone, or just stream it right from their website. The iPhone/iPad app is $1.99, but the stream from their website is free.
Here's the link to the journal article that supports their product: http://www.jstor.org/stable/10.1086/665048
So if you can't make it to your favorite coffee shop, or you just want the right amount of sound to ease you into some productive working time, check it out!