vimtutor
-J-Dswing.aatext=true -J-Dawt.useSystemAAFontSettings=on
Get a copy of rails.vim it is awesome on millions of levels. Read the doc. There are way too many tips, :Rview customer, :RSmodel foo, :Rinvert, gf, :Rextract, :Rake and the list goes on and on. You will probably want NERDTree as well for easy navigation (which you can access using :Rtree)
Follow tpope on twitter (the author of fugative, rails.vim, haml.vim, vividchalk theme, cucumber.vim and so on), he seems to be posting new related to Rails vim plugins quite regularly (be it syntax highlighting or git integration).
Here are some things I do daily with Vim when doing Ruby on Rails development:
cw
Change word - deletes the word under the cursor and puts you in insert mode to type a new one. Of course this works with other movement keys, so you can do things like c$ to change to the end of the line.
f + character
Finds the next occurrence of the character on the current line. So you can do vft to select all the text up to the next "t" on the current line. It's another movement key, so it works with other commands too.
CTRL-W s is something I use nearly every time I open vim.