Fancy completion all over Emacs, not just for buffers and files. https://github.com/DarwinAwardWinner/ido-completing-read-plus

Ryan C. Thompson 078657eae8 Eliminate inappropriate evaluation in macro 11 lat temu
ChangeLog 10ea202d34 Implement whitelist for collection functions 11 lat temu
README.md 7a258468d4 Version 1.7 12 lat temu
ido-ubiquitous.el 078657eae8 Eliminate inappropriate evaluation in macro 11 lat temu

README.md

ido-ubiquitous

Gimme some ido... everywhere!

Does what you were really hoping for when you did (setq ido-everywhere t). Replaces stock emacs completion with ido completion wherever it is possible to do so without breaking things.

Get it from http://marmalade-repo.org/packages/ido-ubiquitous