I am currently running the latest version of Zenphoto (not a nightly) and was wondering if its possible to use IPTC data in album.php as when I've tried it I cant get it to display?

Sorry, not sure what you want here. IPTC data is part of an image. Anyway, look at the fields in the album edit--both for the album and for the images. Any of these fields can be displayed. See also the functions getImageData() and getAlbumData() Plus the multitude of individual functions for database fields.

The database fields are all populated from the image EXIF/IPTC data when the image is first discovered.

Thank you that cleared it up enough for me to figure it out.