Depending on your application, you might consider trying the Digi Xbee modules. They are super small with excellent range and built in encryption and error checking. They operate in the 2.4ghz band under the Zigbee protocol, 802.15.4. All you do is add 3.3v power, serial TX/RX lines from your pic and you in business, it's that easy. They also use free Digi software(X-CTU) to make any config changes, although they work at 9600 baud right out of the box. I have been playing with these for a little while and am very impressed.

John