To be honest there seems to be one or two bugs, as you would expect with any new operating system, but we're not talking the scale of a microsoft new update.
The only bug I can find that I can put down to Apple is that I can't turn off the screen saver. I think that's about it.
Safari doesnt crash. Firefox does but not very often. But that seems to be a well known fact.
Though I must admit I don't think leopard is yet as stable as Tiger, and yes bugs are being ironed out all the time. I'm sure the amd community and Zeph will have much improved the next DVD release even if it doesnt have new apple updates