Pet peeve: Vim should be spelled "Vim," not "VIM."(1) Consistency in case would also make it easier to read in my opinion, Vim/VIM seem to be used interchangeably throughout the article.(2) Other than that, this is a good crash course. =)
1 See spelling in use at http://www.vim.org/about.php
2 "Vim has a small footprint in RAM and on the CPU. A given system can support a great many VIM users at once."