From an owner Comment at the Circuit City site listing for the WiFi-only Samsung Galaxy Tab:
Samsung in their infinite wisdom, decided that we don’t need to pair a bluetooth keyboard or mouse with the device and disabled it. Bluetooth with T-Mobile and AT&T 3G tabs can do this but this one cannot.
And Bluetooth is not mentioned in the specs, either!
Update: Looking at Amazon user comments — as well as the specs — there is Bluetooth, but it’s 2.1, not 3.0. Which makes me wonder what the Circuit City buyer was trying to connect Bluetooth-wise that led him to believe it was totally disabled.
Update 2: Wow, it seems the WiFi version should be avoided altogether:
i bought a wifi only version yesterday, the processor is a TI not a hummingbird, but they are both ARM cortex a8 (i think) the screen and resolution are the same, the Graphics chip is indeed a power VR sgx530 instead of the power-VR sgx540 in the GSM version
Mike Cane’s xBlog 
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I have the 3G version of the Tab (Canada) – when I set up my plain-jane MS Bluetooth keyboard, the Tab insisted on seeing only a European AZERTY layout instead of good old QWERTY. I was able to solve my problem by digging up some cheap apps in the Android market. Took a whole bunch of futzing around, though.
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The wifi version of the 7 inch Galaxy Tab does not have HID bluetooth support. It does have SPP bluetooth however, and if you purchase a Freedom Pro keyboard and use the SPP switch, you CAN pair it. Then download the drivers from the Freedom Pro site for Android. Then enable the keyboard in the “Locale and Text” section of the settings and – it works. Here is a video that walks you through the process:
http://www.simplemobilereview.com/video-pairing-freedom-pro-keyboard-with-android-device/