The TouchSquid Media PC Remote offers full control for your PC or laptop from anywhere in Wi-Fi range. It is intended for use with big screen TVs connected to a Media PC but can be used in may other ways.
This is a two part application. There is a tiny server app that runs minimized on the PC. If you are in your PC browser now, install it from here
The Android app is available on Google Play. It has a large Track Pad area, 3 mouse buttons, and Drag Drop capabilities. The regular Android Keyboard pops up to enter text, but the special PC keys not on the Android are at the top of the screen. A Windows Media Center button starts the MCE app.