It looks to my untrained eye as if there is a dust/sand "trail" down one side of the crater, across the bottom, and up the other side... in the direction of the prevailing winds?

What about the features in the bottom of the crater? Are those just boulders/outcrops partially covered by wind-blown deposits, or are they cones of some kind? If there is/was sub-surface water (as ice or brine) could the residual heat from the impact have produced an upwelling of mud or other material? Could the strips of material running up the sides of the crater have come from these putative cones? Or maybe the "cones" are actually smaller craters, the result of later impacts?

Lots of interesting stuff for Spirit to look closer at. Looks to me that the inside slopes should be navigable - any opinions?