in reply to Favorite Hacks in Emacs
Here is a good survey of such features.
Also see the most useful ones.
An Englishman in New York
An American Werewolf in London
An American in Paris
The Innocents Abroad
An Idiot Abroad
Robinson Crusoe on Mars
A Connecticut_Yankee in King Arthur's Court
There and Back Again
Travels into Several Remote Nations of the World
Results (97 votes). Check out past polls.