One Quickie

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Using Changes.app for hg's diffing (Mercurial->General)

Add this to your ~/.hgrc

[extensions]
extdiff =

[extdiff]
cmd.chdiff = /Local/Apps/Changes.app/Contents/Resources/chdiff
opts.chdiff = --wait

Your Changes.app path is probably different, so be sure to change it. Or add the chdiff's directory to your shell path.

Now you can
% hg chdiff
And get pretty diffing.