A: 

Eclipse 3.1 Official Document: Keyboard Shortcuts

Anthony M. Powers
Could narrow down my search just a little bit more? There are quite a few shortcuts listed there…
David Wolever
Haven't seen the one you're looking for. Sorry, was in a bit of a hurry and was trying to get some form of an answer for you.I don't see one listed, so it's safe to say there's isn't a native shortcut for it.
Anthony M. Powers
+3  A: 

Personally I did not find such shortcut or option. However, there are some possibilities for switching editors from the keyboard (Ctrl+F6 and Ctrl+Shift+E as general ones, or my favourite "all-in-one" Ctrl+3 :) ).

Also, if you work mostly two files 'for a long time' (one in left side and one on right side), you can also use the History operations (Alt+Left, Alt+Right) for switching editors.

Csaba_H
A: 

In all my eclipse usage I've never noticed such a shortcut and I would not expect one to exist. I skimmed though the link provided by Anthony and checked my own copy of eclipse, but none of it looked like what you're looking for.

You can also look through them yourself by going to: Window > Preferences > General > Keys

Chris
Sorry, but there isn't any shortcut in there :(
David Wolever