So, I've done some research and I've noticed that there are several enhancements in Mac OS X 10.5 that make it an absolute dream to work with compared to previous versions. I want to know what features or enhancements you've noticed in 10.5 that you can't live without. Here's my list: "Arrange by" and "Clean up" available from Context Menu and Action button in the Finder. Fine-tuned volume control using Option-Shift and then pressing the appropriate volume key on your keyboard. The ability to have more than one folder selected for custom backgrounds (especially useful when your backgrounds are sorted, eg: Abstract, Nature, Vector, etc). Easier Windows network share browsing in the Finder. AirPort menu responds almost instantly whereas in Tiger it seemed to lag a bit. Cleaner user interface overall. Quick Look saves me lots of time.