Hi Randall,
Photoshop format would not be a problem, I'll include a psd file on the list. However, I still recommend to use a vector file (.ai or .eps) format... specially for large format printing (banners to billboards).
Here's a link to an article to give you an idea.
http://www.logodesignworks.com/blog/vector-graphics-and-raster-graphics-difference HTH.
Thank you
Byron