1. Annotations in Preview. New tools enable you to annotate and markup PDF files using Preview. The annotation tools include comments, links, highlighting, strikethrough text, shapes, text, and arrows.

2. Restore deleted items to original locations. This seems long overdue. In Windows data restored from the Recycle Bin is automatically restored to its original location. With Snow Leopard restoring to the original location is now an option on the Mac as well.

3. Sortable search results. Snow Leopard adds the ability to sort Spotlight search results for more efficient searching. You can sort search data by name, date modified, date created, size, type of file, or label.

4. Nearby printers. When printing Snow Leopard displays the printers that are detected nearby, enabling you to identify and configure the best available device for printing your document.

5. Automatic update for printer drivers. When a printer is connected Snow Leopard connects to the Internet and downloads the most current driver for the device. Snow Leopard also periodically checks via Software Update to ensure that the most up-to-date driver is installed.