If I could add one feature to every website and software product that I use, I’d vote for a “Delete All” button. For instance, I’m really sick of products that are designed to let you send and receive messages, yet force you to delete the old messages one by one. So the more you use the product, the more time you spend just getting rid of the old entries after you’ve read them. This gets frustrating very quickly, and hurts the overall experience. Of course, it doesn’t have to be that way. Just include a “Delete All” button whenever a list has more than a couple of entries, and customers will thank you for it.