Google Docs not quite cutting it for your mobile document editing needs? Is that free version of QuickOffice that came with your phone a little long in the tooth? Then today's a great day to try out the Amazon Appstore. The third-party store features a free download of one paid app every day, and today, it's OfficeSuite Pro 5, normally a full $15. OfficeSuite Pro 5 is your standard document editor, featuring support for Word, Excel, PowerPoint, and PDF files, though the last two are read-only, according to the app's Amazon listing. An integrated file browser and Google Docs connection help round out the software, and happily, it handles the tricky .docx, .xlsx and ppsx extensions without complaining. You can get OfficeSuite for free until 3 AM Eastern Time, and considering how many of you have already pre-ordered the Amazon Kindle Fire, you may want to do so whether or not you intend to use it on your current smartphone or tablet. If you're new to the Amazon Appstore, don't worry - downloading and installing it is a simple process. Just head on over to the Get Started page and enter your email address. Download the app to your phone or tablet, then install it via the standard non-Market method (you'll need to allow the "unknown sources" option in the Application settings menu). Once a free app is "purchased," it's connected to your Amazon account, and you can download it on any device with the Appstore installed.