Have you ever wanted to sit at your desk with a proper phone sitting on your desk, except instead of paying for a landline have that desk phone connect to your mobile over Bluetooth? I haven't, but I still kind of like the idea behind the BlueSIM.
The BlueSIM is essentially just the world's bulkiest Bluetooth headset. But that's okay, because it's supposed to act as a landline phone. Connect it to your phone over Bluetooth, and you can copy over all (or 200 at least) your contacts to the phone. You can set it up to automatically connect to your mobile phone when in range, and it can pair with up to eight mobiles, although only one at a time.
The phone will also stream music from an A2DP mobile, although the inbuilt speakers are kind of average for music (but ok for voice).
For $299, it's way too expensive for what it does. But as a first of its kind product, there's still a lot of scope for bringing that price down and introducing new models.