The more sites I've tried in the past few years, the more I've noticed who cares about usability and who uses it in their marketing slogans. Some of the biggest players on the web define usability as doing what everyone else does. That is NOT usability.
I will pick on my own application to demonstrate:
Let's say you are creating an invoice for your customer in Meiraware Business. You fill out all of the relevant fields, then it's time to put in the invoice date.

Not bad! Pretty easy to use. Standard calendar picker.... can't get much better. This is what everyone does, so it's usable!
or so I thought....
Now lets looks at Remember The Milk's date picker for their calendar
(that right button is not a calendar control)
At first impression, I was thinking "No calendar? What kind of shit is that?" ... then I realized you can type damn near anything in this box. You could type Next Tuesday, May 15 (assumes this year), Tomorrow, Next Thursday. Take a look at a brief example from their site that you can type in this box:

That is attention to detail that ALL OF US could use more of. They took the concept of "choosing a date" and truly made it 'usable'.
In my opinion, there should be a calendar added to Remember The Milk's control, some people do prefer to choose from a calendar. But besides that, it's brilliant.
Jayme
(p.s. I'm sure there are other companies with methods such as these, this is just the first i've seen)
Read the complete post at http://feeds.feedburner.com/~r/JaymeDavis/~3/272418317/