May Ann,
I think you can send as many photos as you like. I think I only sent about 25-30 and they cover a period of about 5 years. I think that as long as you are showing the progression of the relationship over a period of time, ie, photos when you first met, trips taken together, family events, wedding photos, etc, then thats all that really matters. If you think that other areas of your application may be lacking in some areas, then by all means, send as much proof as possible-It can't hurt.
how about the emails??? i've downloaded ones from friendster but couldn't print the ones from facebook. do they need progression or just random emails. thanks