An Important Discovery?

One of our martian probes (the rover that won't quit) Spirit has found a patch of nearly pure silica on Mars. This could be a sign that that either a hot-spring environment or an environment called a fumarole, in which acidic steam rises through cracks.

Why is this important? Well, on Earth (the main source for our database) such environments teem with microbial life. Could we have found a prime target for the planned Mars Science Laboratory or a later mission?

Sounds like a big deal to me. NASA Watch wonders why NASA hasn't given this more attention. I wonder the same thing, the only notice I found was in a non-US media outlet.