I absolutely love, use and constantly look for timesaving keyboard shortcuts.
If you are also a keyboard shortcutaholic check out a "wiki-style database" with an impressive collection of shortcuts grouped and categorized in a very intuitive manner.
In Shortcutworld.com you can search by keyword or by specific software according to the platform you work (Mac, Win, Linux). The list of specific software shortcuts is reasonable.
My favorite section is on all the Google products and Mac.