Make Automator work for you
One of the most talked about features of Mac OS X 10.4 Tiger was certainly Automator, a tool that brought the power of automation to the masses. With a myriad of presets already present in Automator it's easy for anyone to achieve increased productivity in a short period of time.
Moreover, since you can see how the actions are put together it will not take you long to get into the groove yourself and start making some of your own. And there's so much you can do: burn photos to a DVD, covert files between formats, and more. Think of it like a way to efficiently eliminate repetitive and tedious tasks.
Macworld published a good introductory article about Automator that I would recommend to every new Tiger user. It would be a shame not to use Automator when it can offer so much.