Great Stuff !
I can see a couple of "double marbles", some "half marbles" and one "half marble" with an intersting patten.
Fantastic...
By the way the following link shows a fantastic image created by Keith Laney. It shows one of the first patches of soil Opportunity has observed using the the pancam:
http://www.keithlaney.com/OCI/O7.jpgIn the upper right quarter (see attatched image) one can find a couple of half marbles, some broken marbels (white arrows) and even some that appear like shells (look at the shadows (yellow arrows)). I hope you can see what I mean.
What do you think ?