Joel Spolsky - FogBugz 4½ and Subjective Well-Being:
"If you're a software designer, this is it. This is your big chance to do something meaningful to improve the world. Design software that puts the user in control and you'll increase happiness, even if your product is the most boring accounting software imaginable.
[...] Brett also snuck in a feature he's been itching for: lots and lots and lots of keyboard shortcuts. There's only one keyboard shortcut you have to memorize, though: Ctrl+; switches FogBugz into keyboard mode and little letters light up reminding you what the shortcuts are for various commands around the screen."