Track how often you weigh in with Beeminder

Beeminder is a tool for data nerds to commit to progress towards goals. You specify any graphable goal (these Applets assume you've created one) and Beeminder plots your progress. Keep your datapoints on the right side of the Bright Red Line or Beeminder will literally charge you money.
Get more done with Google Tasks. Keep track of your daily tasks, organize multiple lists, and track important deadlines with Google Tasks. Tasks synchronizes across all your devices, so your lists and tasks go with you, wherever you are.