I'd like to second this. There is a lot to Vim and Practical Vim is an excellent read. This book covers a lot of ground and the way it internally references itself is excellent (great for jumping around).
For those outside the US who would like the paper version, use your local Amazon if possible. Postage is as much as the book from Pragmatic Programmer's site.
Links for the lazy (non-affiliate)
http://pragprog.com/book/dnvim/practical-vim
http://www.amazon.com/Practical-Vim-Thought-Pragmatic-Progra...
The better you get at Vim the easier it is to learn more Vim.