In a previous post, which happens to be high on Google's search results when looking for OS X drivers and Logitech products, I lamented Logitech's driver support for not working and mostly keeping quiet about it.
I've recently upgraded my MacBook Pro to Leopard and it seems that the freezing problem has been fixed. I haven't encountered the spinning beach ball of death due to connecting my Logitech headset. But I must confess that I am very cautious currently when attaching the headset, and haven't used it for a while. I'm slightly optimistic that this problem is solved.