Thanks for the follow-up. My iMac has the internal card. I remember going to the Apple store the day after the 1 ghz machines were introduced in Feb. '03 and being disappointed to find out that BT had to be special ordered.
I was an early adopter with the BT keyboard when they came out and have had a love/hate relationship ever since. Apple replaced the original and I bought another one late last year. I'm up to date on all firmware & software but still have the original intermittent repeatttttttting issue!
As far as I know, there aren't any troubleshooting tricks that I've missed and AppleCare expired last month. The problem really isn't something I've bothered to pursue further. When I get sufficiently annoyed, I just dig out the USB keyboard!
Clint