Dubai is a burgeoning city for health care, but I don't know what it'll be like in the next 5-10 years. The society is stratified according to nationality and degree, sadly.
They have a health care city which is almost complete. Harvard has a research school there, and BU has a dental school.
http://www.dhcc.ae/EN/Pages/Default.aspx
By 2012 I think, the hospitals would have been constructed. I suppose it would be a good place to be in, since it's very health oriented.
I don't know what the salaries are, but they're quite hefty if you're carrying a North American degree and a nationality. Plus, Dubai is now jumping into the medical tourism bandwagon. Lots of rich people from neighboring countries are getting their operations done in Dubai, since it provides good expertise.
You can't be a citizen of Dubai, unless you're Arab by blood. If you get into a tussle with a royalty, you're out!
I actually haven't visited Dubai recently. I'll probably be there in the summer for sometime. I'll see if I can gather some info.