godane's copy on archive.org doesn't seem to account for the fact that the images can be jpg or png (and maybe jpeg) and in one of 3 directories.
I made a ruby script to get all the available images here: http://dropproxy.com/f/61C. Feel free to move that over to GitHub and/or modify it.
I'm working on getting the first 100k, though I'm not sure how I'll make them public or whatever. From what I have so far, it looks like it's approx 1 gig per 10000 walls (removed ones included), so I'd estimate ~300GB for all 3 million or so walls.
I couldn't figure out how to get the metadata unfortunately.
--H2u 22:02, 6 February 2014 (EST)
I have walls 0-100k (~30k actual images as most were removed), but I don't think I can do many more images. Uploaded to Dropbox temporarily and added the link to the main page.
I made plans for a script to get the metadata (or at least some of it), will include URLs for images >100k. Someone else can get the images with the URL list with DownloadThemAll! or something.
--H2u 03:53, 12 February 2014 (EST)