thanks for the replies so far.

I read a post in this forum that if all accounts are on one B.net, I could transfer characters between all my game accounts? Can someone confirm this? Is it free or do I have to pay for it? If it is true, that would really sway me towards having them on one B.net. This allows so much freedom in forming a group of 5.

Is there a link from Blizz documenting all these "integrated features" between multiple accounts on a single B.net?

much appreciated.