We can use it as diary and record all important activities, to do list etc. These days spreadsheet is one of the most common program which you can find almost everywhere, be it personal computer, PDA, and the like. Such an easy availability and supports give you sheer freedom to view your data, no matter wherever you are.
Rent or mortgage, homeowners insurance or renters insurance, all utility bills, auto loan or auto insurance payments, gas for your vehicle, food for home, and so forth. Once again, these are items that you cannot live without.