MacBook Pro will not pair with any Bluetooth device

Last night my MacBook Pro stopped pairing with any bluetooth device (I've tried Apple Pro Wireless Keyboard, Wireless Mighty Mouse, Logitech MX900 mouse, Apple Aluminum Wireless Keyboard) and it simply won't pair with anything.
It sees each device but when it tries to pair it fails. With the keyboards, sometimes it'll give me the passkey to type on the keyboard but then it doesn't recognize that I've actually typed it and hit enter. Eventually I just end up with:
"The pairing attempt was unsuccessful. Make sure your keyboard is in range of this computer, turned on and "discoverable." When ready, click Continue to try again."
I've reinstalled 10.5.6 Combo update, tried to pair under a different user account, turned off/on bluetooth, and still nothing.
I did install VMWare Fusion last night and briefly shared the Bluetooth connection to that, so I'm not sure if that has anything to do with it or not.
Any suggestions?

Me too. sigh
All was well until this afternoon, when I swapped out the batteries on my trusty old Microsoft IntelliMouse Explorer for Bluetooth, which has worked flawlessly for me for a few years now. After I put new batteries in, my MBP wouldn't recognize it. I went through the Bluetooth Setup Assistant, and it "saw" the mouse and properly listed it as "Microsoft Mouse". I hit "continue", of course, and the Assistant said "Pairing with your Bluetooth mouse". It got as far as "Connection established" (and I saw the mouse appear in the Bluetooth preference pane", but then I got the dreaded red words: "The pairing attempt was unsuccessful. Make sure your mouse is in range of this computer, turned on and "discoverable." Etc., etc. I made sure of all of those things and tried again, many times, with the same failure every time. I tried different batteries, rebooted the Mac, and so on. No luck.
Figuring my mouse was dead, I went out and bought a Kensington Slimblade Bluetooth Presenter Mouse, brand new, never been paired with anything. Same problem!
Also, I can no longer get my Palm Treo 650 to sync via Bluetooth. It used to be a little flaky (often complained that the port was in use by another application), but rebooting the Treo always solved that. Now, it doesn't.
One trusty old mouse suddenly stops pairing, one brand-new one refuses to pair, smartphone won't sync any more. I haven't installed any system updates or anything else since the Microsoft mouse worked. The only weird thing going on is that I'm having massive network connectivity issues with my broadband connection (probably a flaky cable modem), and a couple of days ago I bought a new Airport Extreme a/b/g/n wireless router, which is at the other end of the house from my computer and now-defunct mice.
Very bizarre. Can the Bluetooth chip or antenna in a MacBook Pro burn out or otherwise fail?
Puzzled and frustrated,
:ian

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Me too. sigh
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