Hex Layer in Photoshop

I need to add a hex layer to a large map I'm working on. Whats the best way to go about this? I'm sure I can find some hex paper online I could hack together but has anyone found a smooth way to do this in photoshop? I thought I had read something on it but can't find the post.

Thanks

Here's a image that should work for you as a pattern overlay.

Thanks SG, I'm gonna need that as well.
-D

And different types of graph paper are easy to create in most any of the vector programs. A free one, like Inkscape, will let you adjust sizes endlessly without worrying about pixelization.

you guys are awesome, thanks.

My thanks, too! Exactly what I needed. Brilliant.