this should be in the appraisals thread, not sure if it was forwarded or not. but it is a good domain. short, pronounceable, hearing it translates into easy spealing, only 5 characters
google keyword said it received 3.6K searches last month, most likely korean or some other asian market
your problem is going to be finding an end-user. assuming you are going after an american (or non-asian market) you can't determine what that site would be by looking at the domain alone. i admit that google and ebay were the same way before development, but it is a problem for you because it would be like taking shots in the target, you would have trouble setting a clear target for whom you want your end-user to be. you would have to be a little lucky for someone to say, "i will name my business konna," and then receiving an offer.
you could also go after the korean market, but i think you would have trouble finding end-users to target, in addition to communication issues
these problems doesn't mean that it's not valuable. but at best, i believe it's a "domainer's domain." i bet it receives a decent amount of type-in/typo traffic which can be used to forward to developed sites.