We have a site here (JPL). But, I don't know if it is the same URL from home. Let me try tonight when I get home and I'll post the correct URL.

The greatest advantage of Spirit is that it is a rover and will be able to "wander" around the surface "looking" at various things. Also, it has a device that will scrape the exterior surface off of a weathered rock face and do a specral analysis of the underlying, non-weathered rock.