Today Microsoft officially announced their new mice and keyboards. The wireless devices are available by the end of the month and the new wired Intellimouse Explorer is not available until February 2004. If you take a look at a close-up of the Wireless Intellimouse Explorer you will notice more well defined finger grooves and a scroll wheel chamber. My scroll wheel seems to always be blocked with gunk of some form, so hopefully the new design is more gunk resistant. There is a leather Wireless Intellimouse Explorer as well.