Vim
Vim is a text editor based off the classic vi editor. It is different from other text editors in that it has different modes of operation. You can learn about vim through various websites.
Vim is a very capable editor for mobile devices because of its low footprint and effeciency of key strokes.
Configuration
Vim can be configured through the ~/.vimrc file. Here are some items that make it easier to use vim on the n900.
# Map the comma key to colon map , : # Press jk while in insert mode to press escape inoremap jk <esc>