I just was making some updates to our budgeting spreadsheets page where we have a bunch of free Excel and Google Doc spreadsheets available. While I was working on it and getting a few new ones added to the page I stumbled upon this Debt snowball calculator for Excel and it is really cool.
As you can see below it has a lot of pretty cool features and I wish I had a spreadsheet this cool when we were using the Debt snowball to get out of debt.
You can download the Excel (XLS) file or find more out at the creators website.