I have several family memorials at the FindAGrave.com website that I've created over the years. What started out as a site for the gravesites of the rich and famous has become a genealogical tool for those who would like to have photographs of far-away tombstones of their ancestors.
I have used the "Request A Photo" feature frequently with great success in obtaining photographs, and when possible, I try to help out others looking for their ancestor's tombstones in my area. It's a great way to give back a little bit to the genealogical community.
One feature that I'm starting to utilize at FindAGrave is the linking feature where you can add family links. By adding these family links, you can tie together whole families at FindAGrave. Often times, one spouse will die and the survivor may move on to another area and be buried in a totally different cemetery. Not to mention how far-flung some families can be. By linking children with their parents, someone can quickly link to all available tombstone photographs of a particular family.
If you haven't yet used this feature, I would highly recommend it.