Quick tip - if you're just using ImageMagick to get dimensions of images, try using image_size instead, it's written in Ruby, works well, and installs really quickly, rather than the five years it seems rmagick to compile & install.

I came across this today when trying to find an easier way to present a six-part form in a Rails project - a tabbed interface system built upon Prototype (an integral part of Rails). Called Control.Tabs it makes tabbed interfaces a synch to do: simply add an unordered list containing links to the blocks containing your to-be-tabbed content, and add a line of JavaScript to start the ball rolling - that's it!