While looking for something not directly related to software development, I stumbled over Joel Spolsky's blog this evening. I've already read most of the articles on his blog an like them a lot.
He wrote 3 especially good articles about "designing for people who have better things to do with their lives":-
http://joelonsoftware.com/uibook/chapters/fog0000000062.html
- http://joelonsoftware.com/uibook/chapters/fog0000000063.html
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http://joelonsoftware.com/uibook/chapters/fog0000000064.html
If you never had the opportunity to read them even though you're involved in software development and/or design, now is the time !!
BONUS ARTICLE: why you should have testers http://joelonsoftware.com/articles/fog0000000067.html