Change "Cancel" to "Reset" in Adobe application dialog boxes
Heres a simple one that is darn handy:
If you wish to reset settings in a dialog box, simply hold down the
Option (Alt - PC) and the Cancel button changes to Reset.
A catch all for little bits of prepress wisdom.
Heres a simple one that is darn handy:
If you wish to reset settings in a dialog box, simply hold down the
Option (Alt - PC) and the Cancel button changes to Reset.

Ever open a Photoshop file and try to remember what steps you took to create that great effect? Well wonder no longer with this little tip.
1. In Photoshop turn on History Logging to Metadata (PREFERENCES>GENERAL>HISTORY LOG) Make sure you have "Edit Log Items" set to "Detailed"
2. Give yourself plenty of History States. This is in option in that same General Preferences dialog box. I use 250, you can have up to 1000, but the more states you have the more ram it takes up, so your mileage may vary.
Once you have that set every edit you make to an image is recorded in its Metadata. You can view the images metadata by choosing FILE>FILE INFO and choosing "History" in the File Info dialog box. It will give you a run down of all the edits you did to an image and help you to remember how you made that great image effect that you want to recreate.
Say you editing text and you wanted to momentarily switch from normal to preview mode (to hide bleeds etc) well if you hit the defalt "w" you end up typing a "w" which sucks especially if you forget you do it and it goes to press :(...so what I did was go into the Keyboard shortcuts dialog and assigned shift + command + F1 to toggle the views while I'm in text mode and now life is all peaches and cream.
Say you have a multi-page PDF document and you just want to print
certain pages.
1. Open the PDF document in Acrobat
2. Click on the "Pages" tab to display the page thumbnails
3. Hold down the Command key and click on the page thumbnails that you want to print.
4. Chose FILE>PRINT
5. In the print dialog click on the "Selected Pages" radio button
Zing zang happy days!
Stop guessing what the complimentary colour for a given swatch is.
1. In Illustrator, duplicate the swatch you're using.
2. Double-click on it to edit it, then hold cmd (ctrl if you're on windows) and click on the colour box in the edit box.
It'll then give you the complimentary colour for the original swatch.
Thanks to Gary for that tip.