What are your favorite (G)Vim plugins/scripts?
The NERD tree allows you to explore your filesystem and to open files and directories. It presents the filesystem to you in the form of a tree which you manipulate with the keyboard and/or mouse. It also allows you to perform simple filesystem operations.
The tree can be toggled easily with :NERDTreeToggle which can be mapped to a more suitable key. The keyboard shortcuts in the NERD tree are also easy and intuitive.
Edit: Added synopsis
Taglist, a source code browser plugin for Vim, is currently the top rated plugin at the Vim website and is my favorite plugin.
A very nice grep replacement for GVim is Ack. A search plugin written in Perl that beats Vim's internal grep implementation and externally invoked greps, too. It also by default skips any CVS directories in the project directory, e.g. '.svn'. This blog shows a way to integrate Ack with vim.
A.vim is a great little plugin. It allows you to quickly switch between header and source files with a single command. The default is :A, but I remapped it to F2 reduce keystrokes.
I really like the SuperTab plugin, it allows you to use the tab key to do all your insert completions.
I have recently started using a plugin that highlights differences in your buffer from a previous version in your RCS system (Subversion, git, whatever). You just need to press a key to toggle the diff display on/off. You can find it here: http://github.com/ghewgill/vim-scmdiff. Patches welcome!
Not a plugin, but I advise any Mac user to switch to the MacVim distribution which is vastly superior to the official port.
As for plugins, I used VIM-LaTeX for my thesis and was very satisfied with the usability boost. I also like the Taglist plugin which makes use of the ctags library.
Tomas Restrepo posted on some great Vim scripts/plugins. He has also pointed out some nice color themes on his blog, too. Check out his Vim category.
No one said matchit yet ? Makes HTML / XML soup much nicer http://www.vim.org/scripts/script.php?script_id=39
My latest favourite is Command-T. Granted, to install it you need to have Ruby support and you'll need to compile a C extension for Vim. But oy-yoy-yoy does this plugin make a difference in opening files in Vim!
The vcscommand plugin provides global ex commands for manipulating version-controlled source files and it supports CVS,SVN and some other repositories.
You can do almost all repository related tasks from with in vim:
* Taking the diff of current buffer with repository copy
* Adding new files
* Reverting the current buffer to the repository copy by nullifying the local changes....
I really love the snippetsEmu Plugin. It emulates some of the behaviour of Snippets from the OS X editor TextMate, in particular the variable bouncing and replacement behaviour.
Zenburn color scheme and good fonts - [Droid Sans Mono](http://en.wikipedia.org/wiki/Droid_(font)) on Linux, Consolas on Windows.
Txtfmt (The Vim Highlighter) Screenshots
The Txtfmt plugin gives you a sort of "rich text" highlighting capability, similar to what is provided by RTF editors and word processors. You can use it to add colors (foreground and background) and formatting attributes (all combinations of bold, underline, italic, etc...) to your plain text documents in Vim.
The advantage of this plugin over something like Latex is that with Txtfmt, your highlighting changes are visible "in real time", and as with a word processor, the highlighting is WYSIWYG. Txtfmt embeds special tokens directly in the file to accomplish the highlighting, so the highlighting is unaffected when you move the file around, even from one computer to another. The special tokens are hidden by the syntax; each appears as a single space. For those who have applied Vince Negri's conceal/ownsyntax patch, the tokens can even be made "zero-width".
"I map the "Command + /" keys so i can just comment stuff out while in insert mode imap :i
I take buftabs.vim and localvimrc.vim with me whereever I go!
buftabs : Minimalistic buffer tabs saving screen space
Local configuration : Use different settings for different directories.
During maintenance of a very big and old C++ project I've created two plugins and these are the only ones I use:
0scan substitute for me taglist, buflist, files explorers, and other things like quick convenience file search.
SourceCodeObedience is very convenient cscope and ctags code surfing with stored history of all your searches with 'Filter' feature.
I use them not because they are mine but because they do the complete job and helps me to maintain of ~1Gb unfamiliar code base.