Mooninites invade West Philly!
found in West Philly. cameraphone pic, so it's not so great. this is made from LEDs and maybe 12inch x 14inch, not the billboards.
just for scale: those are D cell batteries, the LEDs are 10mm super-brights, and the board is about 12"x14".
UPDATE: Err is in Boston.
UPDATE2: check out the youtube link, then go look for them in: NY, SF, LA, Atlanta, Chicago, Philly, Portland, Miami, Seattle, Boston. these put throwies to shame.
UPDATE3: this is the same mooninite board that was borrowed for Good Morning America, NY's ABC7 news and some other ABC national feed. i know a bunch of news sources (online, print and TV) also snagged two of my flickr pictures. hopefully it helped people realize they are not bombs, fake bombs or anything toooo much more complicated than christmas lights.
UPDATE4: Suspect Device: Mooninite