To program a chip I use Arduino-0.22 to load the ArduinoISP sketch on my Arduino Uno board. I made a small board that has 2 sockets, a 20 pin that could be used to program 20 and 8 pin chips and a 28 pin socket that I use to program 328's (like the Uno). Search for Arduino as ISP as there is a lot of info out there that exlains the process and the wiring. My little board has 6 wires between the boards to program the chip and a 120 Ohm resistor between the Reset and +5 on the Arduino Uno. To program an Arduino sketch using the ArduinoISP there is a selection on the ArduinoIDE File menu to write the sketch usin Arduino as ISP.
I use the Arduino-0.22 IDE as there was a change in something in Arduino-1.0 and the ArduinoISP only works at 9600 baud instead of 19200 which causes a problem.
Here's a picture (poor) of my ISP board to use with the Uno.
