MSN Adds Drop Down Search Button

Microsoft is looking for ways, in its BETA Search Product, to increase usability and features. Recently MSN launched this drop down search button that looks like this:

Most usability experts, I think, dislike drop down menus, I personally do not mind them. However, this does not work in IE for Mac or Safari. This is a screen sample from Safari.

There is forum discussion on the new button at Search Engine Watch Forums.