An article relating to this blog post on Finextra:
Facebook users want Web 2.0 banking
New research has found that around half of Facebook users would use Web 2.0 applications for online banking, while a quarter would even consider switching banks to obtain Web 2.0 services.
See article
At the moment if I'm on Facebook and want to check my bank balance I have to click on one of my bookmarks and log in to Smile. That doesn't strike me as too much of a hardship. There is no way I'd trust some sort of banking widget in Facebook, although
when you get past the ghastly marketing speak, Worklight's stuff
looks quite interesting.