Sigh, also missed the $20 amazon deal. That's what I get for working instead of checking out the hot deals...
Right before this deal was posted I broke down and bought the Wave Pro set with the rechargeable version of this mouse for $60 at amazon since my trusty MX Laser died (left click stopped working--probably due to starting DiabloII again...). The Wave Pro version of the MX 1100 only has one battery instead of the standalone's 2. I would imagine that this would make it lighter (though I don't have the regular version so I can't verify). If you need both a mouse and a keyboard the Wave Pro is still available for $60 (no rebate); however, it's been ~$50 AR so if you can wait Logitech often has a $20 rebate.