I’m wondering if you can do something similar to this functionality (available with Zend Studio 5.1) in Eclipse. There is an image of it in action here: http://tinypic.com/r/2d1pao1/6
As you can see, it doesn’t just put a box around the starting brace like Eclipse does, it actually shows you the declaration. This is especially handy when you have a really long declaration and don’t want to scroll up and find its beginning.
(Update May 2012)
The latest “Eclipse 3.8 and 4.2 M7 – New and Noteworthy” introduced Bracket matching improvements in Java editor:
Original answer (December 2009)
Actually, you already have a variant of that with the outline view
If you click anywhere in a function (end of curly brace or anywhere else), the outline view will… outline the relevant function where you are in.
(source: eclipse.org)
Otherwise, you need a plugin like Eclipse Source Helper
(update site: http://www.hexapixel.com/update)