The features outlined here are only the tip of the iceberg. The remaining features can be read about in the rails.vim help file. The rails.vim help file can be accessed with the :help rails command.
The rails.vim script can interact with several other scripts. Vim scripts in general can be downloaded from the Vim scripts archive.
Another important, but often overlooked, thing setting up Vim is setting the color scheme and fonts. Using the graphical Vim frontends instead of the console versions gives you better control over this. Choose a font that's readable, unambiguous (a capital O shouldn't be mistaken for a zero) and with which you're comfortable. Color schemes are also very subjective, but Vim comes with a variety of color schemes for experimenting. There are also other color schemes available in the Vim scripts archive.