Sometimes you just want to see the difference between two files which are not under version control with access to easy diff capabilities. This can occur if you want to check your XML against an example for instance. Someone told me about a tool which can do just that: meld.
Meld is a tool which can act as a diff viewer just as you're probably are used to if you use an IDE in your day-to-day work. It shows the two files side by side and shows the difference between the two.
Fig. 1: Click to enlarge
Something else which is cool is that meld can do a tree-way diff as can be seen below.
Fig. 2: Click to enlarge
As this post was mostly intended to share this tool with people who hadn't heard of it, I im sort of finished. So it's a wrap ;)