Since I've had my iPhone, I've found a few things that I wish I could do with it. I wished that I had a fuel-economy tracker app for my car, an expense tracker for work-expenses and others. I knew I could've set-up a custom web-page backed with a database, but it just seemed that there should be an easier way.It seems Google thought so too, as they've just released a powerful new Forms extension to their Google Docs app, Spreadsheets. Using Forms, you can essentially create a survey or email-based input form for a spreadsheet you've created. This has great implications for those needing to create ad-hoc surveys for your work-mates, friends, family and more. However, there's nothing stopping you from inviting only yourself to the form.To get started, go to Google Docs (sign-up if necessary), create a new spreadsheet. If you want, you can add a few columns with a header row to make things a little easier in the next step. Then, go t...