I personally think there should be a stack exchange area for "shopping". It's nice to have a one stop shop (isn't that what SE's mission is?) for IT related questions.
At times I've had questions like:
"What 3rd party software would you recommend to provide HA and DR for Exchange"
"What online learning sites do you recommend for learning how to create a heterogeneous environment of Windows and Linux?"
"What best practices for network security are currently being implemented in your company?"
These are very subjective...I get that...but it'd be nice to have a place to pose these questions. While I'd love to do my own research and come up with my own conclusions, it's still nice to get a "groupthink" answer with upvotes, etc. That's what Amazon reviews, etc. do for people as well...allow them to see something and say "hmmm...if 95% of people like it...there's got to be some reasoning behind that."
While I can rely on industry mags, Gartner, etc. to make recommendations...I'd rather hear it from people that actually do it for a paycheck.