VicMacs said:and 600kb is enough for anybody's lifetime...
Actually, I can see where's he coming from with that idea. Panther is really a complete OS, more so than Jaguar et al. However, it's obviously going to be less 'heavy' than Tiger (with Dashboard, Spotlight, and numerous architecture layer add-ons). Therefore, Panther was perfect for older Macs, like the Pismo, iMac G3s, iBook G3s, etc.
I'm going to buy Tiger for my new eMac, but I highly doubt I will install it on my Pismo. It's not about obsolescence, it's just about getting the best performance without bogging your machine down. I'm all for Tiger, and I think it's going to be one of the most exciting releases, but I know that a whole lot more layers are going to be added on to this onion.