Eh,
I think you're doing something good here but it might be a force for bad as well as good. here's why.
an online record of tags, throwies, pieces are accessible by everyone including DC police. this is a record that they may not even have because graffiti largely relies on the property owner reporting it. a lotta people don't though, they just paint it over and that's that. no police record of that tag/throwie/whatever, if thats the case. with an online documentary, however, especially if the location is recognizable, all that's required to make it a charge is testimony of the property owner (assuming they can be reached) that that graffiti was there + the photograph that you took. fight it in court, it's you vs. them and you'll probably lose.
Adding what streets/places that it was found on, then, doesnt help either because it helps law enforcement narrow down the potential locations. if they want to get you, they will. this only helps them.
i think your idea is cool. but dont put it on the internet, and especially dont put it on 12oz. ive been involved with a philadelphia zine thing for a little bit that does exactly what you do (sans locations) but none of it is online. it's fresh/original content that goes in print only. it gets distributed/sold to a few dozen people and is stuff i'll look back on & hold close for a long time. being as its a small circle, its all the more special. it's also a whole lot safer for all of us, featured writers/readers/owners.
onto the other half of this rant,
offering to film graff comes into the charge of aiding and abetting. you ready for that? hope so... thats evidence too, that's in your circle. i dont let people film me for good reason, that in my experience most videographers are a lot like you in that they "love the culture" blah blah blah but then when the police come knocking and they need to save their day jobs/college degree they cop a plea and the writer featured gets slammed. happened before will definitely continue to happen. i dont care if your "down" or any of that shit, simple logic tells me thats the case. prove me wrong.
if you stay on this site and keep your site running, you'll run into problems down the road, as well as cause problems for others. if you move off the web asap you'll avoid problems for a lot longer. graffiti writers arent as hard to find as you might think especially now.
/rant
good luck.
