CTRL+SHIFT+I - Fixes the indentation of the selected text.
Awww. That was my big one.
Generally any IDE has this, but if you refactor a class, field, method, variable, etc. name, rather than simply renaming it, the IDE will update all references to that specific class/field/method/variable. In Eclipse, I'm pretty sure it's ALT + SHIFT + R.
While you are typing CTRL + SPACE will bring up the context menu. Normally it doesn't pop up until you use the dot operator.
Also, I'm a huge fan of Eclipse's debugger. From what I can tell, people in general don't use debuggers a lot, but they are definitely a saving grace.