Oh, and just to add...sometimes, you'll have to go through the streets more than once...walk slowly, and look in dark places...the wiki is great help, but I still had to go thru most of the streets twice before I found all seven.
As an aside: anyone know what we should do with the heart, once found? I already used it to "Remember" once, and that's pretty old now...so. Now what?
I found six of the ghosts but I can't find the last one. I've looked in all the locations listed in the wiki and blog post (most of them at least twice). Any advice?
Unless there have been more streets added since I did the quest the list on the wiki should be comprehensive. I even took those screenshots myself. If anyone finds any new streets with ghosts (or if any have moved from their original position) please let me know or put it on the wiki discussion page and I'll update the page! If you're feeling extra-awesome you could even do it yourself.
Thanks and good luck finding that last pesky ghost! :D
Arya Underfoot's Ghost Tours are extremely helpful. That is how I completed the quest. Here is a link to the group: http://www.glitch.com/groups/RUVJLA46O0E23IN/
It doesn't look like there is a new one yet but she usually does them on Wednesdays @ 7! Good luck!
+1 to Sparrow's suggestion. Had 3 left to find and went with the tour. Bingo. Completed the quest within 30 minutes as did a few others earlier. Also it was quite fun tagging in a long line. That evening, most of the peeples were wearing the red top hats with white spots. I think one of us dubbed us the toadstools.