'The Equation Editor Keyboard Shortcut Top 10'
 
These all work, I hope I'm not telling you something you already know, but they seem pretty helpful.
 

Zooming to 400% - Ctrl+4

Inserting Greek letters - Ctrl+G, followed by a letter key

Fraction - Ctrl+F

Superscript - Ctrl+H ("high")

Subscript - Ctrl+L ("low")

Square root (e.g. before "dx" in an integral) - Ctrl+R ("root" or "radical")

Integral - Ctrl+I

Thin space - Ctrl+space

Adding plain text - Ctrl+Shift+E

Going back to math after adding text - Ctrl+Shift+=

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Scott T. Spencer.
 Last updated:  11/02/2005