If you've tried this on Snow Leopard and are confused as to why it looks nothing like the screenshots, you might want to try a different terminal application.

If you've tried this on Snow Leopard and are confused as to why it looks nothing like the screenshots, you might want to try a different terminal application. Terminal in Snow Leopard doesn't support 256 colours, so iTerm2 should show vim-powerline closer to the screenshots. It's open source and works pretty well in my experience. The Terminal in Lion supports 'xterm-256color'.