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I have written a little Java app for mobile phones with GPS that will calculate the Maidenhead Locator Grid that you are in.
This system of identifying location is used in Amateur Radio, as it cuts down on the number of characters used to encode the information, something very useful when using Morse Code.

It's very simple, and lightweight. I have only tested it on a Nokia N95, and it works fine. Please let me know what other phones it works on.
Phones that I have been told it works on: Blackberry 8110.
Phones that I have been told it doesn't work on: Blackberry Pearl.
Please note: Your phone needs to support JSR179 (the Java GPS interface), and if it doesn't have a built-in GPS receiver, you'll need a Bluetooth GPS device too.

You can download it by browsing to http://files.calum.org/Maidenhead.jad Note: This won't work from a PC - only phones that run Java (J2ME).

Any feedback, use the "Contact me" link.

Calum

73s, QTH IO81

PS. The following URLs were useful in testing the code (as they support >6 chars):
http://qth.map.googlepages.com/
http://www.sarl.org.za/public/QRA/Abt_Locators.asp