, analyst and consultant Aaron Wall advises his business clients not to register as .biz. He says the very association with commercial interests that .biz connotes has tarnished the extension.

"Billions of dollars have gone into marketing dot com as a brand. People trust the default and what they are familiar with. The same is true for leading country specific domains like .co.uk. Many people trust .org domains because trustworthy charities have sites on them. Of the sites you visit each day and of the sites you subscribe to, how many of them are built on .biz domain names?"

So far, NeuStar's to expand .biz has not attracted much . There were only two posts when we visited Feb. 20, both lambasting NeuStar for poor handling of .biz.

The comment period closes March 15.