If you are only using the software from home over your own network, I highly recommend Desktop Remote by David Straw. The free version esentially turns your phone/tablet into a touchscreen for your PC, great for using a phone/tablet as a control device when streaming to your TV. The $1.49 version streams your desktop to your android phone/tablet. This allows you to completely control your PC from your phone/tablet, and even view media files with the PC's native players. You can zoom (no pinch though), and there are three onscreen buttons for the mouse buttons, as well as tapping actions.
For those adventurous enough, you can even use this over 3g by forwarding ports 4484 and 4485 on your router to the PC you want to control (you may also have to add exceptions for those ports on your PC's firewall).
----WARNING----
This software doesn't use encryption or any form of security, so only use it over 3g at your own risk!!!! (basically, you probably shouldn't do it)
A very nice app, and I would be willing to pay more for a 3g secure version!