CoinFlip does just that - flips a virtual coin and gives you the result. While there's no pretty coin flip animation, or even an image of a coin, the app has a beautiful big blue button that says "flip" on it. All of <a href="http://www.kudit.com" target="_blank">Kudit</a>'s apps require a login/password. This one happens to be free, while most of their apps are $1.99 for 90 days of access.

<a href="http://www.kudit.com/applications/coinflip/" title="Coin Flip for iPhone" target="_blank"><img src="http://www.modmyi.com/images/apps/flip.png" title="Coin Flip for iPhone" alt="Coin Flip for iPhone" border="0" height="359" width="321" /></a>

<a href="http://www.kudit.com/applications/coinflip/" title="Coin Flip for iPhone" target="_blank">http://www.kudit.com/applications/coinflip/</a>