If you have IMAP, it is synced. PIM (or equiv), sync is important. Bookmarks? OK, point there, but back in the days Netscape had LDAP support for this purpose. IMO this is important for RSS as well. You can have the same RSS feed on several devices, but what kind of use is it to know that some are unread when this isn't synchronized between devices? This is not a NIT problem, just a generic problem.