1. G takes you to the Library Grid mode. (G for "Grid". Get it?)
2. D takes you to Develop module. (D for Duh, I mean "Develop".)
3. T turns the toolbar off and on. (T for Toolbar. Easy, eh?)
4. Left and Right arrow keys takes you sequentially through the images in the filmstrip. (Totally logical.)
5. Esc deselects the Target Adjustment Tool (TAT) in the Develop Module. (Kind of logical... and much easier than moving your cursor over the TAT icon and clicking on it, or clicking on Done in the toolbar.)
6. Command + left/right bracket rotates an image left or right. (No logic, but worth remembering.)

7. L dims the surrounding area, finally leaving the image in its full glory. (L for "Lights'. Easy to remember and a great crowd pleaser.)

8. V turns the image to grayscale in all the modules except Print and Web. (( No logic, except "v" for "very" simple?)

Recycled Keyboard commands Follows logic burned in memory from years of Photoshop use

1. Tab cycles the left and right panels off and on.
2. Command C in the Develop Module copies Develop settings from selected image.
3. Command V applies copied settings
4. Command A select all the images in the Grid mode
5. Command D deselects all the images
6. Ctrl + Click brings up a contextual menu for those without a two button mouse.

Editing in the Library Module

1. Numbers 1-5 logically selects stars.
2. X and P sort of logically select Reject (X) and Pick (P).

Keyboard commands I'll never remember

1. Shift/alt(option)/command/T selects the TAT tool in the Tone Curve pane.

2. Etc.

Keyboard command I can purge from my memory banks

1. Command +S. This one dies hard. But there is no reason to "save" changes. Lightroom automatically does it.

Got some simple, useful keyboard commands you want to share? I have room in my brain for a few more...

PS. The first few photos shown above were taken this week at the Alhambra in Spain, and the close-up is of an African princess from Timbuktu that I met at a photo opening in Madrid.