Xbees in "transparent" mode (firmware type 1) are super simple. If you have a serial port (UART) on the microcontroller, and an adapter for the PC, then it's as easy as a wire. Bluetooth is nice, too, but it doesn't go as far as Xbees, and it's no simpler than Xbees.
The one thing with the Xbees is that you first need to set them up to find each other (similar to Bluetooth pairing) -- you do this in the Xbee software in Windows. Once they "see" each other, they are a wireless wire.