It's not a game project, but over the past couple days I've been designing and developing Beals Software's Small Business Accounting. It's very simple accounting software that basically just allows you to enter transactions, selecting a type (income or expense) and then categorizing it. Currently it is only setup for MS SQL storage, but I have plans on adding XML and MySQL (for the possibly forthcoming ASP.NET interface.)
I mainly made it because I wanted an offline accounting software that I could control. Took about 2 days and the majority of the work went into the data storage system I have in place and a tool to generate classes and sprocs for my SQL tables.
It's still missing some features (contacts are not in-place and I'd like to implement some different reporting features), but for the time being it will work.