ido-completing-read-plus

ido-ubiquitous

Gimme some ido... everywhere! This package replaces stock emacs completion with ido completion wherever it is possible to do so without breaking things.

Get it from MELPA: http://melpa.org/#/ido-ubiquitous

Version 3.0 changes

ido-ubiquitous version 3.0 is a major update, including a split into two packages, and some of the configuration options have changed in non-backwards-compatible ways. If you have customized ido-ubiquitous, be sure to check out M-x customize-group ido-ubiquitous and M-x customize-group ido-completing-read+ after updating to 3.0 and make sure the new settings are to your liking.

How to enable ido in as many places as possible

If you are using this package, you probably want to enable ido everywhere that it is possible to do so. Here are all the places to enable ido that I'm aware of.

Ido itself

First, enable ido-mode and ido-everywhere.

(ido-mode 1)
(ido-everywhere 1)

Smex

Smex allows you to use ido for completion of commands in M-x. First install the smex package, then follow the directions to set up key-bindings for it.

ido completion in org-mode and magit

Org-mode and magit have their own support for ido:

(setq org-completion-use-ido t)
(setq magit-completing-read-function 'magit-ido-completing-read)

ido-ubiquitous (this package)

Install this package and then turn on ido-ubiquitous-mode:

(require 'ido-ubiquitous)
(ido-ubiquitous-mode 1)