Best admin you have seen
I am creating a applications at the moment and I am looking to get every aspect spot on
Can you show me any demos of a application's admin which you think has a good look and is very easy to use.
Why not look into them yourself through googly?
What kind of applications are you looking for? What are you going after?
A little more clarification may help other users get their thoughts across.
Wordpress is user friendly. Set up a blog and look at their backend.