Activating debug on error

Meta-x toggle-debug-on-error

Evaluating lisp expression

Meta : EXPRESSION

Evaluating lisp expression and insert result in text:

CTRL-u Meta : EXPRESSION

Opening file on another machine via ssh

CTRL-x CTRL-F, then enter /ssh:MACHINE.DOMAIN.NAME:/home/YOURHOME/FILENAME.TXT

When using flyspell, correct the last word

The command to do this is flyspell-check-previous-highlighted-word (so try META x, then flyspell-check-previous-highlighted-word)).

This is much more useful if bound to a key. For example, to bind it to CTRL-c j, use:

(global-set-key (kbd "C-c j") 'flyspell-check-previous-highlighted-word)

in your .emacs (or equivalent) config file. (This tip is from http://www.emacswiki.org/emacs/CustomizeAquamacs#toc22).

Useful extensions

• http://code.google.com/p/yasnippet/ - template system for Emacs

Undo fill-paragraph

You can set fill-columnn to a really large number, and fill:

C-u 10000 C-x f M-x fill-individual-paragraphs

Source: http://stackoverflow.com/questions/2471557/how-to-undo-fill-paragraph-in-emacs