Hello,
Here I am for a quick update:
So, yes not many companies bought into info, org, biz, net even the ones which are considered "domain clever".
In domain clevers, I will put General Electric, Kraft, Procter & Gamble, Johnson & Johnson + a few pharmaceutical companies (by far the largest domains portfolio owners..based on my search)
These are the only names I found so far:
3M own Projectors.org / MacAfee own Webimmune.net & Hackerwatch.org / Johnson & Johnson own Diaperrash.info / Office Depot own: depot.biz /
Limited to pharmaceutical companies: quite few info & biz registered, but those names seems to be trademark, so not really keyword/generic domains.
I will continue my research.
Please feel free to add your contribution