Simon,
I think B&O were simply interested in adding a mobile phone and MP3 player to their range of products. Obviously they realised they could not enter this extremely competitive market from scratch and therefore got in touch with Samsung, who in all fairness can produce some excellent kit.
The Serene was in huge demand when it first launched in 2005. However in my opinion, the Serenata just was never as unique as the Serene and offered very little more tech-wise than the Serene, other than a sliding speaker and a very off-putting method of navigation.
The BeoSound 6 was greed and I doubt I could ever be convinced otherwise. In many cases, B&O has designed the look of a future product and then challenged the technicians to work around the design to create the best audio and visual experience possible. This was quite clearly not the case with BeoSound 6, as it looked exactly the same as its South Korean brother which had been launched before the BeoSound 6. The only difference was the metal finish. B&O were not interested in the time and effort to create their own BeoSound 6, took the cheaper and easier short-cut, and messed up.
I have never strongly criticized the Serene and Serenata because I do quite like them and I was excited to see this new category of products, even if it included the Samsung badge, but we all know they wouldn't have been possible without.
On the other hand, and this is the point I would like to make is that B&O didn't need Samsung to create the BeoSound 6. They managed to surprise us with BeoSound 2 in the early days of the MP3 player and it really was competitive at the time. B&O could have put investment into BeoSound 6 to surprise us again, but didn't.
Yes I have squibbled, but I hope B&O realise that BeoSound 2 was a great product and that they could do this again by themselves. Maybe B&O thought the Serenata could be a competitor of the iPhone with both phone and music function
but I would still like to be realistically ambitious and think that B&O could create a premium rival for an iPod Touch or similar.