Not all GSM phones with a touchscreen interface need to be chunky and cuddly. Here's an unlocked phone that's been on a diet. [ http://www.chinavasion.com/83v9 ]
This touchscreen cell phone has its size under control. It's a fairly svelte 55mm thick (not bad for a dual band tri band cell phone) and has a three inch touchscreen interface.
See the specs at [ http://www.chinavasion.com/83v9 ] or see what else is available at [http://www.chinavasion.com/index.php/cName/mobile-phones/ ].