Apparently I hadn't tortured myself enough:

http://picasaweb.google.com/doubleofive/EmpireSpecialEditionChangesHD

I'm not very far into it, a lot of little things here and there, new wipes, Luke picking up his lightsaber is about 3 frames off for some reason in the SE...

More to come, of course.

EDIT: posted the first section and came across this a few seconds later in the movie:

You used to be able to see the glow of the engines through the bridge section, the section comes into frame later and never quite overlaps the bottom SD. Also looks like the bottom SD is at a different angle. Wow, a lot of work to have never been recognized.