Lots of people have asked us where they can get the 32-bit Enabler and the Macintosh Hardware System Update. As yet, they have not appeared where the net public can find them. We have received contradictory information about whether or not these programs have even been released, so as a result, our advice is to sit tight for a bit and not worry.
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).