Tippy Tipper - tip calculator

I just created my first Android application called Tippy Tipper. It is a simple tipping calculator app with the following features:

• Enter bill via custom keypad
• Select tip by slider or three configurable buttons
• Real time calculations
• Round up or down by tip or total
• Can split the bill
• Can optionally exclude a tax rate from the bill

The project is open source and free. I'd appreciate any feedback on it.

You can find the project's code here: tippytipper - Project Hosting on Google Code

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Screen shots:

 

For any who are curious, I also wrote about the things I learned from writing this application.