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":
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