Wow!!! I'm totally blown away. After installing Ruby, Rails, Mongrel & MySQL yesterday, I've just followed this simple tutorial and created by first Ruby on Rails application. I had no idea how fantastic Ruby on Rails really was. I'm lost for words - the power is apparent already and I haven't even got into learning about the cool AJAX stuff either. I must have been sleeping under a rock for quite some time as I've certainly been missing out on something awesome.
I'll be putting my PHP development on the back burner for a while - I've got me a new toy to learn. :-)