Just noticed that The Wire plays in 16:9 when viewed on Amazon's Prime Instant Streaming service. I assumed that this was Amazon matting the original 4:3 frame, but to be sure I started S01E01 from the DVD on my TV, and the same episode from Amazon on my phone. Amazon's image isn't cutting off anything from the top and bottom of the image - it's actually a true widescreen frame with more image on the left and right. Also, Amazon's picture quality is better than the old DVDs (YMMV depending on bandwidth, I guess). I skipped ahead a few seasons on Amazon and they look to be 16:9 the whole way through. Time for another rewatch!