Data Liberation Front

Google is centralizing (or starting as a concentrated effort) in Importing and Exporting data from Google Products. Their motto

Users should be able to control the data they store in any of Google's products.  Our team's goal is to make it easier to move data in and out.

Site: http://www.dataliberation.org/

They have listed import/export options against each google product on that website and are adding better options like the recent addition the "Convert, Zip and Download" feature in Google Docs