ANONYMOUS  What version of StuffIt Expander are you using to uncompress? The help page says there's a conflict between the compressed package and Expander 8.0.0 that can cause this.  
(Version 5.2.3)

BART  Use the stuffIt Expander in Utilitys that should work.  
(Version 5.2.3)

ANONYMOUS  I hapened to catch the PBS program NOVA about the Mars rovers. In many scenes of engineers and scientists sitting around tables discussing aspects of the project i could see the Apple logo on the lids of laptops, and in at least one scene someone was typing information on a silver Powerbook!

Hey, these people are at the cutting edge. What else would they own? :)  
(Version 5.1.3)

SANDRIFT  I am a Mars scientist, and I can confirm that many of us do prefer Macs; it's not at all uncommon to see as many Macs as (or more than) PCs at professional meetings. See my reply to the next comment down as to the utility of this expenditure of tax dollars...  
(Version 5.5)

SANDRIFT  For those folks who might seriously wonder about the value (in tax dollars) of this software, I can say that this tool is very useful for those of us who study Mars professionally. The quality or availability of data often is determined by season, illumination conditions (e.g., local time), etc., and being able to have a tool like this helps calculate and visualize conditions on Mars. For scientists and engineers responsible for planning daily rover or orbiter operations, it's even more important to have access to information about things like what time it is at a given site at a given Earth time, what season it is, where the subsolar point is, etc. In short, while this may be a nifty "toy" for the interested public, it's actually a very useful tool for scientists and engineers, and worth the development effort/cost.  
(Version 5.5)