Thanks, taming, that was helpful clarification on using two Kobos at once.
So ...
A kobo book, loaded with the kobo desktop app, will be live on two Kobos.
A kobo book, as an ePub loaded through ADE desktop app, can be live on ONE kobo only.
Did I get that right?
Also, I played with the wifi Kobo at a store today. It's snappier than the original but otherwise pretty much the same. The dictionary feature works ok although it's a bit of hassle to invoke it -- but it's still a nice to have.
The wifi is truly only for buying books -- from any wifi hotspot. But browsing is tedious; as with a Kindle you are probably better off purchasing on your PC. The biggest "
hmmmm ..." is that the wifi does not bookmark sync, through your library at the kobobooks store, with other devices. That is: you are reading on your wifi Kobo, with wifi on, and you close the book on pg 23. You switch to your Blackberry, and it syncs with the library ... but the pg 23 bookmark isn't registered unless you sync with the USB cable.

It leaves me asking ... then why wifi?
Still, the Kobo is nice as it is and the incremental improvements for the same price are most welcome. But it doesn't look like a reason to upgrade.