Yeah that’s what I originally bought mine for as too! (Well, twofold really. 1) To access the Pi’s serial console from my MacBook Air for initial setup and then to access various UART devices with the Pi once WiFi and BT was setup.
There’s also an HC-05 module out there that can work in master mode as well as slave. (Meaning it can directly connect to another module without a computer, acting like a wireless UART, akin to two Xbees in UART mode!)
@RWB That Adafruit module is nice for the auto-baud feature! Though it’s expensive compared to the HC-06 here which costs $2 on Deal Extreme. (Compared to $10 at Amazon it’s not quite as pricey though.)