The question Which ereaders support the EPUB3 format? is list question where the answer will vary overtime. Should it be converted to a community wiki question?
@eyal (OP) has argued in the comments that he supports this action.
My argument is simple; the subject matter for this site is relatively narrow. Having some canonical, updatable answers available will make it a useful resource for the larger audience of ereader users.
I asked this question because I saw it as a useful followup for someone reading the answer to what is the difference between epub2 and epub3. It was the first thing I wondered after reading that question, and I think the answer to it should be here as well.
I think this usefulness overrides the drawback - that such a question is not ideally suited for Stack Exchange sites because it needs to be updated.