Remember? Not Forgotten -- Dave Warker's Remember?, a superbly simple calendar and reminder application that got its start as a desk accessory, has at last migrated to Mac OS X with version 4. Although Remember? doesn't show banners in its calendar for multi-day events, its superb and original interface and flexible reminders make it a welcome alternative to iCal, and at $20 shareware, it's a bargain. [MAN]
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-]).