Creating grids using Photoshop’s guides can be a pain in the behind if you’re doing it manually. If you’re working on website designs, you no-doubt find yourself doing this regularly; and hating every moment of it.
Pixel accurate columns, rows, midpoints, and baseline guides can be easily created in your Photoshop document with the click of a button using GuideGuide. Frequently used guide sets can be saved for repeat use. Grids can use multiple types of measurements. GuideGuide is available for Photoshop CS4 and CS5+. Best of all it’s free.