Last week I talk about the Rules of Thirds, an imaginary two equally-spaced horizontal lines and two equally-spaced vertical lines that assists your composition.
You also learned that finally even Adobe recognise the importance of The Rule of Third in photography. The crop tool in their latest Photoshop CS5 Extended will superimpose a "Third Rules" over your to be crop image, hopefully guiding you to a better composed crop.
The only problem I find about those very fine overlay lines, they are a bit hard to see; wouldn't it be nice if we can have easy to see white lines and we are able to overlay them to our image anytime we want?