Bluetooth seems to be stabilizing according to Martin Little of Mobitopia. While I was a big Bluetooth doubter about a year ago, I'm starting to come around.
First, the analogy that Bluetooth is a "wireless serial connection" vs Wi-Fi's "wireless Ethernet", brought home what the technology is good for. Also, it's short range which means it can be used for proximity applications. At the same time, Bluetooth is directionless, eliminating IRDA's major weakness. Finally, Little's article hints that the last hurdle to widespread acceptance is starting to be addressed: it's too damned hard to program for Bluetooth!!