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With not much judicial precedent to go by, there has been very little regulation regarding who can and cant register a .com domain with the early bird being the winner.
With the new TLD's being introduced and the tightening of the intellectual property legislation in regard to them, will the unprotected .com remain king?
If you have managed to aquire a .biz domain and met the requirements and challenges to obtain it, is there a possibility that in the mind of the online consumer, .biz may in time become more creditable? Will search engines place more weighting on .biz as opposed to .com?
Pending on your outlook, now is a great opportunity to obtain excellent .biz domains as well as pick up one or two .com domains which are in the process of expiring!
I picked up only two .biz domains. One was for a real estate company name where I missed the .com, the other was just a semi-speculative buy on a fairly broad industry term.
As for SEO weight, while I CAN see adding weight for incoming .edu, .gov, and .mil TLD's (with the highest weight given to .mil, because those guys just don't give out links freely), I would equate .com, .biz, and all the rest.