try http://www.ee.surrey.ac.uk/Contrib/manx/tourism/pgrphrs/pgrhrs.htm
for the info that allows one to date it
re sites then interesting photos are often accepted by IoM newspapers (but I guess they want some form of story) - otherwise if you can scan it I'll happily host it for a few weeks - my www.manxnotebook.com site should be going live in a few more days and maybe thats one thing I can add - however for people its very difficult if photo more than 50 years old.

The Manx museum can often help re location as staff there have seen many photos - info like the registration number/vessell name/type are quite important