I just came across a great post for all web designers. (This is for everyone from the extreme newbie to the seasoned pro)

If you are marketing online, these are just a few things that you need to absolutely make sure you avoid.

13 Ways To Generate Customer Hate | Internet Marketing Strategy: Conversation Marketing

My Favorites

#1. The Flash Intro (Even Google Hates These!)
#5. Animated Buttons
#13. See it and it will make sense.

Josh Sommers