-Ctrl+shift+T and start typing the name of the class - Allows to open a class using regular expressions without needing to search the packages of the project and without using the mouse.
-Ctrl+shift+R - The same thing but for all the other files in the project (think property files)
-Mark occurrences - When you put the cursor in a variable, type, it highlights all the uses in the current file. If you click in the return type of the method it highlights where the method can return (explicit return, exception, etc). If you click in a throws clause in highlights the methods that can throw that exception. Great stuff when you want to know the impact of a change.
After trying lots of IDE's eclipse was the only one that make me give up on emacs for java programming
Does visual studio has something similiar?