This site scratches two of my personal itches:
The signs at 2 Dundas E and 2 Dundas W, Toronto, seem to be the primary culprits here, but that's only because I do a lot of work for a client that has an office in the tower at 1 Dundas W, and these big obnoxious signboards are practically right outside the window. If you're going to have a big obnoxious signboard, you should at least have it "five nines" uptime (as they say in web hosting, 99.999% uptime). These guys aren't there yet, shall we say.
If you didn't notice it, you can mouse over the tiny images to see their caption. Also you can view the full-resolution images by clicking on the medium size images pointed to by the thumbnails.
At present these are all my own, but I welcome contributions. See the Contact Form. You'd need to give the location and date. Be sure your photo does not include any identifiable people in the background, or if it does, you need to submit a legally binding model release in hardcopy, which is just a pain.