I was confused when I first noticed that Disk Copy was gone after upgrading to Panther. I was pleasantly surprised when I realized that Disk Copy had been merged into Disk Utility. I was overcome with joy when I realized that the core features of Carbon Copy Cloner and NetRestore had been integrated into Disk Utility as well.
Hardcore users will not find all the options and settings they rely on in CCC and NetRestore, but this will be very useful as it adds some very important capabilities to Mac OS X. For those not familiar with CCC and NetRestore, here are some senarios of what Disk Utility can now do:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031030154346917