There's a certain variety of budgeting I've yet to see, but that I think would be very valuable. It's something I'd pay a decent amount for, actually.<p>The majority of my expenses and income are very predictable, such that I get paid every N days, I get billed X every Y days, etc. I would like to see an application that tracks my balance for every day, from now and into the future, such that I can see my predicted balance on, say, February 21st.<p>It could also tie into my bank account and track current and past spending, both to recognize recurring events and to update the current balance, which also cascades into all the future predictions.