One local cemetery that seems almost a model for restoration is Mt. Peace, in Lawnside, NJ (just over the bridge). According to their website, while the graveyard was created in 1890, it fell into disrepair in the '50s. In the '80s, the neighborhood took it on as a volunteer project and started to clean it up. New trustees then implemented some helpful changes, including the implementation of cleanup as a probationary project, purchasing tools and equipment, and applying for grants to assist with the preservation of the cemetery.
I haven't been to Mt. Peace yet to see the results of their efforts, but I plan to on November 22nd when they offer a cemetery restoration workshop that will include discussion of African-American burial traditions, cemetery restoration techniques and strategies, and a sprinkling of history, all for the low cost of $5. You can download the workshop flier for more details.
I hope to see some of you there!