They are pretty much the same. Some of the features of the ZR6 (moonroof, leather seats, NAV system) are options on the Limited. I'm comparing the 2008 models here. Looking at the pictures, the Limited comes with adjustable crossbars on the roof rack--looks like the ZR6 only has rails. The Limited comes with 6-spoke alloy wheels while the ZR6 has 5-spoke. The ZR6 has the repeater lights on the fender and the antenna on the roof. The Limited has no repeaters (they have been added to the mirrors for 2009) and the antenna is on the fender (moved to the roof for 2009). We also have the option of 2WD--my Limited is 2WD as I had no need for 4WD. In 2009 the Limited has also added push-button start with smart key, a VSC disable button, auto on/off headlamps, and the aforementioned changes to the mirrors and antenna. For some reason they made the power driver's seat optional in '09--you pretty much have to get the heated leather seats to get it now. There may be more differences but that's all I can think of right now. You can go to buyatoyota.com and check it out. When it asks for a zip code use 70805. Thanks for this info & detail, junebug.