With the latest update in Google Docs it has become pretty easy for you to export all your Google documents into Microsoft office, Open Office or PDF format. All you need is to select all your folders and then click on more actions > Export. ( Make this an Word to PDF converter as Google Docs accept MS documents which can be now exported as PDF 😉
As experienced by Matt Cutts
I had about 81 personal docs (~13MB) and it only took about a minute to bundle the files up into a .zip file
And if you have huge number of files, just configure it to email you once the zip file is ready for download. Pretty Neat.