I think it's really important for cooler heads to prevail here. Although the graphics certainly aren't 100% identical, they do appear similar from the low res screenshots at first glance. The guy from Popcap seems willing to engage in a civilized dialog, so let's not burn that bridge by immediately saying "Screw you, sue me if you don't like it!" because who knows, they just might. Then what do we do?
If it's just a matter of changing some colors around or something else minor I don't see the harm if it means avoiding potentially disasterous legal complications. bk