Are you a designer? Do you work in Photoshop? Do you want to make your life 415% easier?
If you answered yes to the above, run (don’t walk) to download GuideGuide, a grid-making Photoshop plug-in by Cameron McEfee. I use this constantly to create web design comps. It’s seriously sped & cleaned up my work exponentially.
(Get this: if you have an active marquee, it will create the guides within that selection. Brilliance!)
GuideGuide: Don’t Open Photoshop Without It.
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PS: If you have any “Can’t live without ’em” plug-ins for CS, please share!