Take a couple of minutes now and read this page:
I've noticed over the last month or so that people often put in comments like "I've been using my Mac for years and didn't know that!" even when I write about some pretty simple stuff. The beauty of the OS X UI is that it does a great job of masking complexity. The reason I love OS X is that if I dig just a little I find all kinds of cool things that are not readily apparent on first glance.
When I go through that list, which I've scanned through many times, I always seem to find something cool.
Chances are you will too.