Here are some of my observations after using Google News Archives' newspaper browsing:
- The image quality is very low. It depends on the issue, but I found the images to be scanned at a much lower quality than other newspaper sites. It made them hard to read and I couldn't get very good images from them to add to my files.
- You can't save the images. I used the "Snipping Tool" in Windows 7 that allows me to get a snapshot of any part of my screen that I want.
- I was unable to search the images. The OCR scans seemed to be lacking, possibly due to the poor image quality. So you pretty much have to browse these newspapers.
- The newspaper editions are not properly sorted. I found that Google said that issues were missing that were actually included in the previous date's images. Make sure you browse the editions before and after a missing date and you might find what you are seeking.