Every once in a while I would open up a source file in vim to change text using the block selection mode, mostly when editing SQL files. Now I can do it from within Eclipse (from 3.6 and above). The block selection mode can be toggled using the toolbar icon in the top of your editor or using the shortcut key Alt+Shift+A. Nice addition to the Eclipse editor.
I don’t know the mac shortcuts. I tried a couple of them, but on a windows keyboard attached to my mac.