...I think the data obtained to date leads one to conclude that we will not likely find evidence of past water-driven processes in these locations. I hope I am wrong about that.

Its pretty clear that Spirit is sitting on top of volcanic materials. If Gusev Crater was ever home to standing water, its likely buried beneath our capacity to find it. Perhaps our observations at Bonneville crater will prove otherwise.

Things appear slightly more promissing with Opportunity. In the next several days we'll learn more about the local hematite there. Then, Opportunity will return to the bedrock outcrop armed with a systemtic research plan intended to test several operating hypothese mission scientists or contemplating.

So, for the moment, no "smoking gun" and evidence suggesting the contrary. We shall see what tomorrow brings.