"My experience is admittedly limited here, but as far as I can tell, installing a Rails app is impossible. "
The Life Cycle of Programming Languages, by Betsy Haibel [previously] for Model View Culture. [more inside]
What The Rails Security Issue Means For Your Startup summarizes the impact of recent arbitrary-code-execution security vulnerabilities in Ruby on Rails: "What Do We Do When Apocalyptically Bad Things Happen On Our Framework of Choice?"
Ruby on Rails 1.1 is out and you can pretend you know what Ruby on Rails is after reading the overview on the homepage or checking out the screencasts if you have some time. Some might recognize this from prior posts (perhaps, undeservedly) or from some of the web applications that were developed with it.