Hi, at this time (2013-02-05) it's not possible to share a bank, and sharing of pages works but is roundabout.
Sharing of pages will be fixed for 1.4.6 (soon, latest 1.4.7). Sharing of banks is going to happen, but might take a couple of months.
Thanks for your patience as the App grows to accomodate all the amazing suggestions. Also: feel free to make a suggestion and submit it on this site, too. I thought there was one but I cannot find it.