how about if your company name is Pen Island? it makes sense to have pen-island.com for that, hyphens make a lot of sense, it is too bad that somehow a stigma got attached to having hyphens in names, because there are many cases where separating the keywords makes for much greater readability
here are a bunch of names that would benefit from hyphens
http://www.pcmemoirs.com/2010/06/02/...-domain-names/