Watch Lifehacker's YouTube overview on how to transfer Google Docs from a personal account to a Google Docs @Blake account:
If you're migrating to a regular Google account, transferring your Google Docs is easy. Just select all the documents you want to migrate, go to the More Actions drop down menu, and choose Change Owner. Type in Account 2's address in the box that comes up. You'll see all your documents in Account 2.
Unfortunately, Google Docs does not allow you to change the owner to someone of a different domain, meaning migrating your documents to a Google Apps account takes a bit longer. Luckily, it's still pretty easy. Select all the documents you want to transfer, go to the More Actions drop down, and click on Export. This will compress all the documents into a zip file and download it to your hard drive. Afterward, you can go to Account 2 and hit the Upload button in the top left corner, and choose all the documents you just downloaded. It'll take a bit longer, but you still won't lose any functionality or data, which is nice.
Note that any documents for which you are a collaborator but not the owner will not transfer correctly with either of these methods; you'll need to contact the owner of those documents and tell them to re-share them with your new account.