In addition to skipping the initial restart used in earlier installations, Apple has pared down the number of clicks it takes to install Snow Leopard. If you're doing a simple upgrade to Snow Leopard, click the Continue button. Now, back to that initial installation screen: The Utilities option lets you restart and boot the computer from the Install DVD (the same as if you held down the C key during a restart) in case you want to erase or repair your hard drive, or restore it from a Time Machine backup. With the installation files actually on your Mac's hard drive and the fact that every part of the install is written to a log file, the installer can simply pick up where it left off when your Mac is restarted. If something interrupts the process (say you unplug your iMac by mistake), that's not a problem for Snow Leopard. The installer also has a safe redo feature. The installer doesn't delete them, but it does move them out of any system folders or directories to ensure a smooth installation.
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Before installation, it scans your Mac for any applications or other tools that extend Mac OS X (like third-party System Preferences panes or device drivers) that are known to cause problems with Snow Leopard. The Snow Leopard installer has a couple of other tricks up its sleeve. It also means that when the Mac checks the integrity of the files to be installed (which used to mean verifying the integrity of the DVD, a process that took so long most people opted to cancel it), it does so after the files have been copied to your hard drive, speeding up the process but also making integrity checks a built-in part of the installation (since you can't skip them).
First, it saves you time because you don't have to wait for your Mac to boot from the DVD (which often takes a few minutes or longer), and the installation itself goes more quickly because the files are being installed from your hard drive. The reason your Mac doesn't need to boot from the Install DVD is because one of the first things the installer does is copy all the files you'll need for installation to your hard drive.
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