I feel somewhat afraid of shooting at 1) as I know very little about ebook specs and ebook readers different than mine. Still, friendly google took me to
http://www.niso.org/workrooms/daisy/...2005.html#Bkmk - which, while intended for audio, solves similar problem and is very similar to the Sony approach - and I started to think that maybe instead of inventing new format we could just document and use Adobe's one (maybe introducing some restrictions). Here
http://code.google.com/p/epub-revisi...pleAnnotations seems that some people could think similarly.
What do you think about such an idea? Or, if not Adobe's, maybe someone's else format could be used?
Are you (or anybody here) able to share annotation format used on other devices? What is Kindle saving?