SmartToolkit adds some sweet functions to your device, as well as a beautiful interface.
A new Start Menu, which is more XP / Vista like is added, as well as a Clipboard function that allows you to Cut/Copy/Paste, activate 2P (Double Press) functionality as well as using the numeric keypad to navigate (acting like your D-Pad).
A automatic keylock is included, with a great screensaver function that allows you to display analog clock or digital clock when the keys are locked. Also possible are shortcuts to STK functions (but also any program), which can be defined within the STK settings.

SmartToolkit is designed to run on Windows Mobile based devices. It should run fine on WM2003, WM5 and WM6 devices. Note: Only Smartphones are supported (also known as Windows Mobile Standard devices now). PocketPC's (Windows Mobile Professional devices), those with a Touchscreen, are not supported!
Apart from an ActiveSync connection that is required for the installation, you don't need anything on your device or your desktop PC to run STK. No additional software, no .net Framework 2 or anything.

The installation is quite easy. The current version RC07 Beta comes as CAB file, which is a Windows Mobile installer file. Simply copy it onto your device in any folder, and click it using the file explorer of your device. The installation should then start.
The installer should ask you if you want to start STK after installation. Choose yes to start using STK immediately.