Before you ask, the answer is no, there is no error in the headline. The name of the Adobe Photoshop Panel add-on is GuideGuide. It has a silly name, but it’s one of the more useful add-ons I’ve seen in quite a while, and it’s absolutely free.
GuideGuide is a custom Panel you add to Photoshop which makes creating precision guides as simple as entering some numbers and clicking an icon. Rather than go into loads of detail, I encourage you to check out the GuideGuide page Cameron McEfee has put up for sharing his creation. If you’re a web designer creating comps, or a graphic designer looking for precision column guides, this Panel is going to make your life MUCH easier!