I'm a big fan of source control programs. For Windows, I love TortoiseSVN. So I integrated TortoiseMerge:

Now there's a new menu where you can choose between files in memory, or files from disk (note you are still checking files from disk, so you'll need to save your work before DIFFing).

After that, you'll get a TortoiseMerge report that graphically represents your differences.

In order to use this feature, you'll need to have
TortoiseSVN installed.
Oh and Cerveza, you're welcome....
