Indesign CS4 v6.05
Update came out today. Resolved:
Fonts are not getting embedded in documents exported to Digital Editions from InDesign. 
Content is dropped during export to Digital Editions when two or more documents are included in a book. 
Export for Digital Editions will put underscores, rather than spaces, in the Contents if TOCStyle is not used. 
Bold (and in some cases italic) won’t work when exporting an InDesign document to Digital Editions. 
Exporting to Digital Editions fails with an error in the Italian and French version. 
Not drastic, but every little bit helps.
CS5 purports "Enhanced Ebook Creation" and "Ipad/iBook support", whatever that means. It calls the export to be "Epub" in the menus, as opposed to "Digital Editions". The demo is released (I think today), so if I get bored, I spin it up.