We've just made our fundamental dataset available for free download in Excel. The data covers 15 years of quarterly corporate fundamentals, and is the same that we use for our own charts. For now, we only cover the S&P 100, but the plan is to expand to the S&P 500 in the near future, and to add additional data fields. To check it out, navigate to any company on StockPup - like this page for Wal-Mart (WMT).
We've also announced a partnership with Factual. These guys have a cool web-based system that allows people to review the data, propose corrections, and audit changes. Obviously, the quality of data is crucial, and we've heard complaints from users of other commercial datasets that there was no systematic way to improve the data. Well, with Factual there is. Here is a link to the Factual finance page, which includes our dataset: http://www.factual.com/topics/show?topic=Finance.
In addition, Factual provides a Web API for third party developers who want to build their own charts or apps using our data. We are using it too, to develop convenient ways to preview the data directly on the StockPup web site. If you are a web developer, definitely check out Factual and their API.