I have been a contribitor on Find a Grave for many years. I manage quite a few memorials, not as many as some. Most memorials are relatives, but others are ones that I inhereted from other managers based on transfer requests or simply because memorials could not be maintained by the current manager who asked if I would take them over. I am a strong believer in stewardship and I would not want anyone that has passed to be forgotten. Here are the links for the sites I frequent most (* free registration):
Veterans Affairs Grave Locator
Online Cemetery Records and Burial Indexes
This cemetery is quite special to me as I have ancestors buried here:
Your Ancestors Demystified 