Haven't been, but I thought some Star Wars geeks (iSm) may be interested. The Discovery Science Museum in Santa Ana (just a couple miles further down the I-5 from Disneyland) has an exhibit running for another month (through 4/15):
STAR WARS: Where Science Meets Imagination.
There is an extensive picture review on
one of the MiceChat Blogs (not quite half way down the page - after the DCA updates).