It's working for me in InDesign CS5.5 for the two EPUBs I created.
If you've used the Books feature, you must put the metadata in the chapter file which is the Style Source. That's what I did and it worked for me.
Thanks, Steve. Since I'd naively applied styles after having created the indd book, I'd had to apply styles to each doc. in the epub files, so now I've put the metadata into each of those files, and lo and behold, now the author name shows up in ADE. Much thanks for the tip.