If you want to stay organized and manage your daily expenses through your phone, then Expense Manager Android App is everything you need. Expense Manager is a great app for managing your expenses and incomes.
You can track expenses and incomes by week, month and year as well as by categories. You can have multiple accounts or even schedule payments/recurring payments. Pictures of receipts can also be attached to your expenses. And the app can also convert data into charts for a better review.
For people using Android 2.2 or above, a backup of the data can easily be taken on the SD card.
The App is very useful and is available for free in the Android market.