While browsing the demos and the forum I realized many people use RemoteObject for remoting and i wanted to point a very nice AS3 remoting library called SSR (Super Simple Remoting). Features like caching and paging makes it a great alternative to RemoteObject!
Also regarding Rails remoting there is a plugin named RubyAMF that I think is better than WebOrb for Rails
because it doesn't require configuration files and it's faster.
These two should definitely be checked out!
Please post your opinion!