参考：

1、http://www.vim.org/scripts/script.php?script_id=1218

2、http://www.dutor.net/index.php/2010/05/vim-the-nerd-commenter/

参考1：

The following key mappings are provided by default (there is also a menu
provided that contains menu items corresponding to all the below mappings):

Most of the following mappings are for normal/visual mode only. The
|NERDComInsertComment| mapping is for insert mode only.

[count]<leader>cc |NERDComComment|
Comment out the current line or text selected in visual mode.

[count]<leader>cn |NERDComNestedComment|
Same as <leader>cc but forces nesting.

[count]<leader>c<space> |NERDComToggleComment|
Toggles the comment state of the selected line(s). If the topmost selected
line is commented, all selected lines are uncommented and vice versa.

[count]<leader>cm |NERDComMinimalComment|
Comments the given lines using only one set of multipart delimiters.

[count]<leader>ci |NERDComInvertComment|
Toggles the comment state of the selected line(s) individually.

[count]<leader>cs |NERDComSexyComment|
Comments out the selected lines ``sexily''

[count]<leader>cy |NERDComYankComment|
Same as <leader>cc except that the commented line(s) are yanked first.

<leader>c$ |NERDComEOLComment|
Comments the current line from the cursor to the end of line.

<leader>cA |NERDComAppendComment|
Adds comment delimiters to the end of line and goes into insert mode between
them.

|NERDComInsertComment|
Adds comment delimiters at the current cursor position and inserts between.
Disabled by default.

<leader>ca |NERDComAltDelim|
Switches to the alternative set of delimiters.

[count]<leader>cl
[count]<leader>cb    |NERDComAlignedComment|
Same as |NERDComComment| except that the delimiters are aligned down the
left side (<leader>cl) or both sides (<leader>cb).

[count]<leader>cu |NERDComUncommentLine|
Uncomments the selected line(s).
 
install details
The NERD Commenter requires Vim 7 or higher.

Extract the plugin files in your ~/.vim (*nix) or ~/vimfiles (Windows). You
should have 2 files:
    plugin/NERD_commenter.vim
    doc/NERD_commenter.txt

Next, to finish installing the help file run:
    :helptags ~/.vim/doc

See |add-local-help| for more details.

Make sure that you have filetype plugins enabled, as the script makes use of
|'commentstring'| where possible (which is usually set in a filetype plugin).
See |filetype-plugin-on| for details, but basically, stick this in your vimrc
    filetype plugin on

参考2：

这是一款供Vim使用的插件，看名字可以知道，它和The NERD Tree同属一个作者。使用这款插件，你可以对多种文件类型的文件进行不同方式地、快速地注释。这对使用Vim来写代码或者修改配置文件的同学来说，无疑是提升效率和快感的一件利器。你可以到这里来下载这个插件，将压缩包里面的doc/和plugin/文件夹丢到~/.vim/下面就是安装了。为了可以使用其帮助文档，你还需要在Vim中执行:helptags ~/.vim/doc/来注册。
　　简单介绍下NERD Commenter的常用键绑定，以C/C++文件为例，详析的使用方法，请:h NERDCommenter。在Normal或者Visual 模式下：

,ca，在可选的注释方式之间切换，比如C/C++ 的块注释/* */和行注释//
    ,cc，注释当前行
    ,c，切换注释/非注释状态
    ,cs，以”性感”的方式注释
    ,cA，在当前行尾添加注释符，并进入Insert模式
    ,cu，取消注释
    Normal模式下，几乎所有命令前面都可以指定行数
    Visual模式下执行命令，会对选中的特定区块进行注释/反注释

注：各命令前缀是可以自己设置的，通常是逗号’,'或者’\’.