I’m very lucky in that I work with two vim gurus: Chris and Travis. Basically any question I have ever had with Vim, these two were able to answer them. But for times when they are not around I love using these sites:

• List of useful tips: http://rayninfo.co.uk/vimtips.html
• Wiki page of tips: http://vim.wikia.com/wiki/Main_Page
• Cheat sheet (PDF): http://www.sm.luth.se/csee/courses/smd/139/smd139_vi.pdf
• Color coded cheat sheet of keys and their commands: http://www.viemu.com/vi-vim-cheat-sheet.gif

This is a very short list because Vim is based on a few basic concepts and building on top of that. Once you get the basics, learning how to use buffers and macros gives you the ability to edit your files in any manner.

Find and delete a directory:

find /PATH/TO/DIR -type d -name SEARCH -exec rm -rf {} \;

Find and delete a file:

find /PATH/TO/DIR -name SEARCH -exec rm -rf {} \;

Search within files:

 grep -r "SEARCH" *.EXTENSION /PATH/TO/DIR

Find and search within files:

find /PATH/TO/DIR -name "SEARCH" | xargs -I{} grep -H SEARCH {}

For more advanced options there’s always:

man find
man grep