Making divider lines in Photoshop
Here's another quick tip I use for making dotted or solid lines in Photoshop. When you need divider lines that are equally spaced for side navigation or tables, try using a text box with a lot of period's or underscores instead of individual layers. It makes it easy to keep the divider lines equally spaced, and also makes it easy to adjust them later on just by changing the leading.
If you just need a single dotted line, just use a pixel font and set the anti-aliasing to "none".