Arduino uno - pcb

Hi,

I have started learning Arduino. I bought an Arduino Uno and I want to ask a question about this. Do I have to use this Arduino Uno in my project? Can I remove the microprocessor and put in my PCB? If I can't, how I can supply the voltage arduino uno on my pcb?

Lots of standalone information out there:
Here
Nick has done a super job here:

5 volt power supply:

Edit: FYI, PCB stuff
http://forum.arduino.cc/index.php?topic=186256.0
http://forum.arduino.cc/index.php/topic,141946.0.html
http://forum.arduino.cc/index.php/topic,142714.0/topicseen.html
http://www.veecad.com/