Eclipse usage can be so many times more productive once you know these great shortcuts (such as Ctrl + Shift + R for opening any resource (file, project etc), Ctrl + Shift + T for opening any class (T as in Type). But these can be hard to remember at times.
Thus, burn this into your brain: Ctrl + Shift + L
It will bring up a list of all keyboard shortcuts in Eclipse, with searching the descriptions as-you-type.
Note: When using Ctrl + Shift + R / T, note that you can use wildcards in any pattern, such as: *TheEndNameOfSomeClassYouKnow