Made some progress over the weekend. The shield detail pages now have a semi-visual representation of the pins used. It didn't quite work out as well in reality as it did in my head, unfortunately, but it still looks OK I think.
I've also added a form for submitting new shields (including uploading a pic). Anything submitted via the form goes straight into the DB, but with a flag that keeps it hidden until I've reviewed it. The form isn't very well tested but it seems to work and it's time I got some sleep.
Jon