Google Docs already has an option to export every document you check off, but checking them all off is a time-wasting pain. Now it's much more simple to grab everything, 2 GB at a time, in zipped-up files.
The Digital Inspiration blog points out the new addition to Google Docs' export options. Simply select any file by checking the box to its left, then hit the More Actions menu and select Export. In the box that pops up, there's a check box at the bottom to "Export all your files (up to 2 GB)" which, for most users, covers just about everything. Those with more will be prompted with a list of the files that couldn't be exported, so you can grab them next. You can also choose what format your files are downloaded in, which is mighty helpful as well.
Google Docs Finally Makes It Easy to Download All Your Documents [Digital Inspiration]