If you've read my post on Live Extention then you'll be familiar with Aubrey de Grey, this barbically-challenged individual, as he says his piece at the Technology-Entertainment-Design conference last year.
I can't see anything unethical about this kind of research at all, so long as nobody forces you to live for a thousand years if you don't want to. The more I look at this the more I think that it could work... not that I'm any more keen to try it myself. As I said before, it's not for me. I'm concentrating on the quality of my life, if necessary at the expense of some of its quantity.