Just gonna name a few I didn't see here, but which I still find extremely helpful:
- Gist plugin - Github Gists (Kind
of Githubs answer to Pastebin,
integrated with Git for awesomeness!)
- Mustang color scheme (Can't link directly due to low reputation, Google it!) - Dark, and beautiful color scheme. Looks really good in the terminal, and even better in gVim! (Due to 256 color support)