Quote:
Originally Posted by franksisco
Until you give me good news I will not buy my Kobo ereader.... 
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Then you are not buying a Kobo eReader.
Kobo fully supports syncing of annotations within their apps and devices for books purchased from them. You can add or edit annotations on any of these places and the should sync to the the other apps/devices. And, as far as I can tell, this is roughly the same for all the manufacturers and app coder. The only extra is that for Kindle, if you email a book to the device, annotations will be synced for these books as well.
Going outside of this is a problem. There is little if anything happening between un-alike apps/devices. There are some basic problems such as there being no standards for doing this. But, I think the biggest reason is that not enough people would actually use it to make anyone that has to write and maintain the code care enough to do it. People will say it is that Amazon, Kobo and the like just want to keep people inside their walled gardens. That will be part of it, but, from my experience, the amount of people actually using annotations is small enough that it probably isn't worthwhile with the other issues.
There are tools to export the annotations to some other formats. Most of them produce text or HTML versions of the annotations and do not integrate with the book or a viewer. Again, this is due partly to standards, but also to just how difficult it is to do. Linking a marked bit of text in one format and reader to another format and reader is not necessarily easy. If only epub was involved, then it gets easier. But, it is only "easy" if exactly the same book is being used everywhere.