There have been some real time speedrunning for the three games. And there have been new discoveries for ESB and RotJ at least, can't remember any for SSW as of now.
Jadin made a "god TAS" run of ESB, with the purpose of how fast a perfect real time run could be. You can see that run here: www.youtube.com/watch?v=uykDZvQfBCc.
A perfect TAS will of course be even faster. It does however show a couple of neat tricks and glitches. Such as despawning all the eyes on the Dagobah boss, as well as skipping the Boba Fett fight.
For Return of the Jedi I discovered a Sliding Teleport glitch. By sliding and being pushed by an enemy, you can go through the wall.
Such as for a nice shortcut:
https://www.youtube.com/watch?v=IIYtEOqLHJM
And to skip the two guards before Vader:
https://www.youtube.com/watch?v=WG0y5aB2FW0.
It can also be done in the Power Generator (Though currently with Leia only) to skip some parts of it.
It is also possible to skip both boss fights in the Ewok levels. You can see them in the console record run:
http://www.twitch.tv/edenalsda/c/2162992
I guess that is all I have to share currently =).