This spreadsheet has evolved during our marriage. It originated as the budget spreadsheet from my personal finance class at BYU, but has been totally reworked along the way. Bryan Sudweeks, the instructor for that class, made the resources from the class publicly available. You can go to the root directory and look around, or look at lecture presentations, class readings, or teaching tools. The budget is a teaching tool. Dr. Sudweeks put together the resources in a more web-friendly format here.
Some of you might be saying (as my dad once told me) that they already have fancy computer programs to do all this for you. This is true. I have played with Microsoft Money and always intend to learn GnuCash. However, the feature I like most about using a Google spreadsheet is that it is not tied to a single computer. Some of you might suggest a site like Mint.com. The Google spreadsheet still requires manual entry of information, and only contains entered notes and dollar amounts. No account numbers. I am not sure I trust Mint (or any other site) with all my account information. Maybe I should check it out anyway.
Feel free to give me feedback on the budget spreadsheet, share other budgeting resources, or correct my understanding of the features available from existing software.