On: Mac OS X hidden features and nice tips & tricks

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Spotlight also has keywords -

kind:pdf

date:yesterday

author:short_name

from:contact_name

And the boolean relations AND, OR, NOT work as you might expect.

There's a lot of cool stuff hidden in Spotlight. Try

    man mdfind 

to play around with command-line Spotlight.

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Here is a particularly good resource on this aspect of Spotlight:

http://hints.macworld.com/dlfiles/spotlight_cmds.txt