The Logitech V450 Nano Cordless Laser mouse is said to do a whole year with the same set of batteries. The only reason for me to buy a notebook with a cord is that it will never need new batteries. But if they last this long and you get warned well in advance before the mouse to die then please give me the V450. Actually I already bought it and it works great. The USB thing really is very small (although it´s still there), the mouse has a good (low) weight and the connectivity and reponse are perfect. Recommended product!
The Logitech LX710 laser desktop is quite a high end desktop set. The keyboard looks great and types fantastic. The mouse is comfortable and light. Both devices work on 2 AA batteries which can of course be rechargeable ones. If you have a PC in your living room and use it a lot. Go spend some money on this great set.