Comparing and Rating Different Frameworks for Ruby

Hello,

I was searching for few alternates for Ruby Framework and found quite
few of them on the net.

It would be nice if there is already a detailed comparison available for
them or can be discussed/Rated here based on general opinions and
preference.

This would give us a general idea of missing and highlighting points of
frameworks.

Here are few of them. Please add more here if missing.

FRAMEWORKS ( Except Ruby on Rails )

(1) Ramaze :- http://ramaze.net/
(2) Camping:-
http://redhanded.hobix.com/bits/campingAMicroframework.html
(3) Merb :- http://merbivore.com/
(4) Sinatra:- http://sinatra.rubyforge.org/
(5) Nitro/Og:- http://www.nitroproject.org/
(6) NARF:- http://www.narf-lib.org/

It would be nice if supporting web servers are also mentioned along with
your ratings and suggestions.

Thanking you.