There is a new product called Microsoft Office Accounting Express 2007 (long name, and yes MS Windows only), which allows small business to handle many aspects related to finance from one application. The most interesting integration that I see with this software is with the eBay and PayPal, which you can track sales activity and handle PayPal invoices easier.
Best of all – It is available for free:
Microsoft® Office Accounting Express 2007 is an essential tool for managing your business finances. Whether you’re a small or home-based business, you can use this simple accounting program to make pen and paper-based tasks a thing of the past.
With the familiar look and feel of Microsoft Office, Office Accounting Express 2007 is easy to use and helps you save time, get organized, and do business online.
You only need to enter data once so you can save time managing everyday financial tasks. All of your customer and financial information is stored in one place so that you have a complete view of your business. You also have the tools you need to sell online through eBay® and get paid faster.
Microsoft Office Accounting 2007 – [Microsoft]