Depends on what you want to do. If you want to backup the positions and restore them later, my Kobo Utilities plugin can do it for the Kobo ereaders. But, if you want to sync the position so you can open the book in the calibre viewer and then send it back to the device later, then no.
Theoretically it is possible, at least for epubs and Kobo and probably Sony's. I have done it manually a couple of times to prove this. I didn't pursue this as the interface to the view didn't exist, or wasn't usable for this (don't remember now) and Kovid was promising an update to the view after the update to server. I don't know if he has started this.
Also, I'm not as convinced as the usefulness now. As you need to connect the device to sync the positions, I'm not sure I'd bother using it over just searching for the chapter and text in the chapter.
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