Check it out, this is the same type of site, but designed for Salesforce.com.
Dell's Ideastorm is a branded version of 3rd party software, which means that we're likely to see a lot more organizations take notice. According to the feature comparison chart at CrispyIdeas, the enterprise version of their software goes for $495 a month. That seems quite reasonable to me.
What may be even more interesting is how these sites are put into practice. Like I said before, discovering popular customer ideas is the easy part - but finding the balance between customer voice and business objectives can get messy quickly.
Either way, I think this is an innovation in the customer community world.