Hi there,
I'm a newbie here too - although I've been using Ruby & Rails for well over 18 months now.
Ruby, as I'm sure you know, is a very rich object-oriented scripting language. Rails is a web application framework written using Ruby; that is a vast collection of scripts, libraries and plugins that provide a MVC (Model-View-Controller) framework for building modern web applications.
Rails has excellent support for AJAX and leads the way on cutting edge stuff like RESTful routing.
There are many good tutorials for Ruby itself, such as Why's (poignant) Guide to Ruby:
http://poignantguide.net/ruby/
Why is a prolific Rubyist who knows his stuff & writes in a slightly (okay, very) insane style. If that isn't to your taste there is plenty more stuff out there. The definitive book on Ruby is 'Programming Ruby' (known as the 'pickaxe', due to the cover image), now it's in 2nd edition but the first is available freely online:-
http://www.rubycentral.com/pickaxe
Other useful Ruby sites are:-
http://rubyforge.org
http://www.ruby-forum.com
http://www.rubyinside.com
You can even try Ruby live in a browser here:-
http://tryruby.hobix.com
Rails is all Ruby (well, mostly) and you can't really get anywhere without a decent understanding of it.
There has been an explosion of Rails books over the last year. The ones I'd recommend are:-
Agile Web Development with Rails, 2nd Ed (if you only get one, get this)
Rails Recipes
Both these and 'Programming Ruby' are by the Pragmatic Programmers:
http://www.pragmaticprogrammer.com/
Most of the Apress Rails books are good too and like the Pragmatic ones you get buy PDF versions at half the cost of the printed ones.
The best, most up to date Rails info is usually found in blogs. Some good ones to start with are:-
http://nubyonrails.com (he also does the excellent peepcode rails screencasts)
http://www.sitepoint.com/blogs/category/ruby-on-rails/ (they are giving away a free Rails book ATM!)
http://wiki.rubyonrails.org/rails/pages/OtherBlogs (a big list for you to browse) through.
Hope this helps. If you have any specific questions, I'd be happy to try and help.