Did this involve ww points? I'm almost certain they were forced to close by Weight Watchers. Even the popular palm pilot program on the Whiteoaks site recently stated they received legal notice to remove their program.
If it wasn't WW related, there are a few programs out there like you described.
http://www.onmyweigh.com/tools.html may be what you are looking for? Her description says "This is a spreadsheet I created to help me track my weight loss. It graphs your loss and figures out your BMI, your average loss, potential date to reach goal, etc. You must have Microsoft Excel to use this spreadsheet."