Auth flows for web widgets?

[George Fletcher]

Hi,

I'm wondering if anyone has developed UX flows for web based "widgets" 
that don't implement the "password anti-pattern"?  Most widget's that 
require an identity provide an "authentication form" on the "back" of 
the widget. I'm trying to figure out how to propose a good user 
experience that doesn't require the "password anti-pattern". For 
instance, it seems weird to popup a browser window from the "back" of a 
widget. Just wondering if anyone has examples for solving this. I 
realize a widget container can help... but I'm looking for the 
standalone solution right now.

Thanks,
George