All comments (up to 2012-02-12) were processed, so most of the images from imageshack are now saved locally.
I'll continue trying to get those which were not available in the first pass (I started a second pass, several more were available which weren't a few days ago).
There are still some PNGs not converted, but I guess these were uploaded by people who didn't had too much pics anyway, we can converted such pictures manually when we randomly find them in comments.