Some months ago, a person from Packt Publishing posted a message in the rubyonrails-talk list looking for potential Authors/Reviewers for new Ruby on Rails books. Now I'm proud to announce my book  "Aptana RadRails: An IDE for Rails Development".
If you are using  Aptana RadRails, or if you are looking for an IDE and you still haven't decided which one to use, you might be interested.
It's my first book, so of course there is a lot of room for improvement; but it can come in handy, specially if you don't have any previous experience with the Eclipse interface, which can be a bit intimidating at first.
If you want some background information or want to get in touch, you can visit my profile on workingwithrails by clicking on my name