A nice online tool for managing your auction business - Multi-OS Freeware. Auction Business Manager is a sweet tool that helps you keep track of income and expenses for your online auctions, like with eBay. It also color codes your listings so that you can easily see who you need to ship packages to, and who still needs to pay.

There is a nice statistics page that tells you, by month, what your expenses were, what your income was, and how much profit you made, so it's super easy to see how well your business is growing.