I've been using Photoshop CS3 for quite some time in my work, but this one has really bugged me. When I have created a vector shape with the Pen tool, as I want to move those anchor points precisely to a specific point I sometimes need to snap it using some guidelines. But the anchor points don't seem to snap to any guides or even to edges of my other layered images.
How do I make the anchor point snap to guidelines?
Try to uncheck all of the other snapping options and check just the one you need.
From the top menu: View » Snap to » Guides.