I recommend that everyone involved in web design, web applications, etc. read this article.
The oldies continue to be goodies — or rather, baddies — in the list of design stupidities that irked users the most in 2005.
Take something you’ve designed for your church, your personal site, an evangelistic outreach, publicizing an event, or whatever, and run through this list of 10 and see how your creation fares. Learn from it.