I am wondering if the extention of domain has an impact on google ranking? If yes, what is the most desirable domain extension for web site?
No it does not have any impact on domain extension, but most desirable domain extension is .com and specially if you have premium domain name (p.e.: apple.com house.com, dating.com, ect ) with .com extension.
I dont think so. Some .info do very well on search. I think .com is good because if you take laymen and people who are not net geeks then for them a website is usally a .com
.com is the most desirable one. It is a good one to start with. As your business grow you could consider related ones like org or net.
i think .com is good. I am not sure but if domain is country wise then it can affect in google's serps for that particularly country domain of google.
Domain extension have no impact on Google ranking, the only thing is that .com is the most popular used domain extension.
Even though my traffic keeps increasing and I registered the domain for a couple of years in advance, I don't think it has any impact on SERP.
Domain extension do not matters. But if you are targeting any specific location (country), then domain extension helps.
there is a humor that .edu/.gov/.mil will help a lot ... but nobody could beat or confirm this hummor
Local hosting and domain with country's extension and content of local language, e.g. German, would help to go up in Google.de but if you're aming for USA/English speaking, .com is best t start with.