Ctrl+Space: content assist
Ctrl+Shift+L: shows a list of key bindings!
Ctrl+T: Show type hierarchy
Ctrl+Shift+T: Open Type
Ctrl+Shift+H: Call hierarchy
F3: Open class/method/definition
Alt+Shift+{←↑→↓}: Java block-wise selections
Ctrl+F3: Show structure (mostly equivalent to outline)