Help on project - building a wireless controlling device

I want to build a wireless controlling device for my final year project. It can be used to turn on or of any electrical device remotely. I am using a PIC. it will operate in the 433Mhz band. Any advice ,information or tips on how to do this project and what RF device to use will be appreciated.

Check my PIC tutorials, which do pretty well exactly what you want.

Yes you can control many number of devices using single RF tranmmiter..
Lookout the schematic below.. You can replace PIC instead of IC..