Some are getting checked in the MF.com threads:
http://www.millenniumfalcon.com/phpbb/viewtopic.php?t=9032&start=300
and they're doing pics:
TIE garbage mattes removed
http://img269.imageshack.us/img269/2355/starwarsepisode4anewhop.png
Misaligned shot extension
http://img849.imageshack.us/img849/2355/starwarsepisode4anewhop.png
'Humdinger' frame
http://img847.imageshack.us/img847/6919/starwarsepisode4anewhopu.png
Death Star explosion color revised
http://img710.imageshack.us/img710/2355/starwarsepisode4anewhop.png
Wampa arm extension
http://img36.imageshack.us/img36/4733/starwarsepisodevtheempi.png
Color correction Chewie finds 3po pieces
http://img18.imageshack.us/img18/8933/starwarsepisode5theempi.th.png
there's others.