For a long time Microsoft has made a line of keyboards called the Natural series. These are the slightly weird looking keyboards that have either split key arrangements or angled keys to help reduce repetitive stress injuries.

What the series has lacked, until now, is a mouse that also features a design to reduce repetitive stress injuries as well. The new mouse has one of the longest product names I have seen, Microsoft Natural Wireless Laser Mouse 6000. I feel like I should be sing/shouting it to the tune of Mystery Science Theater 3000. The guys over at Everything USB got their hands on the MNWLM6k for a review.
Review excerpt: "It's about time that Microsoft released a mouse to accompany their keyboards in their Natural line of ergonomic hardware. Sporting a high-precision laser tracking engine, the latest IntelliPoint 6.0 drivers for Windows and the incredibly high and angled positioning designed to reduce pressure on the carpal tunnel, is Microsoft's new Natural Wireless Laser Mouse 6000 the next greatest thing to happen to the wrists of people stuck looking at a screen all day?" Buy your own Microsoft hardware here.