In an agile world where the majority of application development is now iterative the testing of applications has never been more important. After all, the impact of single undiscovered error can now be easily compounded through multiple iterations of an application; making it that much harder and expensive to discover and fix later on.
FinancialForce.com, focused on building cloud based business applications on the Force.com platform, has released an API for its accounting application (i.e. The FinancialForce Accounting API). The API gives access to the entire suite of accounting tools available through the accounting platform (e.g. cash management, reporting and dashboards, ordering and billing, etc.). Although FinancialForce.com built the application with Force.com, and the target audience began with Force.com developers, the application has been integrated with many platforms and APIs (e.g. Google Apps, Basecamp, Facebook, PayPal, etc.)