Thanks dd!
Good, balanced article. I think that it makes three wise points with which I think many folks would agree.
(1) If you can get XYZ.com, get it.
(2) If you can not get XYZ.com (and say only ####-XYZ-####.com is left), but you can get XYZ.info, then it "may" be worthwhile getting XYZ.info -- "If there's a perfect name that ends in .info or .biz, it may be worth taking. These domains can be branded with success."
(3) There are some alternative extensions that have been hyped and have little value. Interestingly, the author of the article does not classify .info or .biz in that group. "Many other domain name extensions have been hyped up through glossy marketing campaigns in an attempt to boost their popularity...Personally, I'd stay away from these domains at all costs."
These points roughly outline my view on extensions and it is interesting to see them written elsewhere in a brief well-written format. I might only add the aspect of some domain extension diversification to reduce risk.