Quick links:

Polar Clock. You could get used to telling time this way.

15 Coolest Firefox Tricks Ever. Over-the-top headline, but you might find some of the keyboard shortcuts handy:

* Spacebar (page down)
* Shift-Spacebar (page up)
* Ctrl+F (find)
* Alt-N (find next)
* Ctrl+D (bookmark page)
* Ctrl+T (new tab)
* Ctrl+K (go to search box)
* Ctrl+L (go to address bar)
* Ctrl+= (increase text size)
* Ctrl+- (decrease text size)
* Ctrl-W (close tab)
* F5 (reload)
* Alt-Home (go to home page)

If you really like these, there's a list of the most common shortcuts for Firefox, and their equivalents in IE and Opera, at Mozilla.org.

5 Techniques for Enhancing Contrast in Digital Photos. Someday I'll really learn Photoshop. For now, it's piecemeal, through articles like this one.