ThinkFree is a Java-based advertising-supported online office suite that includes three applications: a word processor (Write), a spreadsheet (Calc), and a presentation package (Show), along with a sprinkling of social-networking features. Unlike many Ajax apps, which have popped up over the last year or so, ThinkFree started its life back in 2000 as a traditional freeware application, eventually moving online.
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Certainly one advantage ThinkFree has over many online apps is that it acts like a real suite rather than a group of separate features. The My Office page, which is the launch-point for users, centers on a list of all the user's ThinkFree documents (which kind of document is indicated by a colored icon); recently accessed documents are listed across the top. Down the left side is a status panel that displays information such as how much of your 1-Gbyte storage space you're using and the folders you have created to store your documents in.
ThinkFree is an advertising-supported service (and, like so many online apps, seems to be in a constant state of beta). There are text ads for sponsored links in a separate window on the right side; interestingly, the window can actually be dragged closed, hiding the ads from advertising-allergic users. However, by doing so, you also hide your comments box and tags, which is a clever way to offer users a choice.