Standard disclaimer, IANAG (I Am Not A Googler):
As I understand it, user preferences are an iGoogleism, and,
generally speaking, will not be supported in most OpenSocial
containers. I've heard reports that they work in Orkut, but, unless
we here otherwise from the powers that be, you
Appending an application URL with `up_whatever=value` will make the
value accessible using the preferences module. This is a handy thing
as you can give a URL out that passes something to the iframe like
`up_show=overview`
or
`up_show=detailup_item=12`
However, it must be noted that anything
