Storing Locale And Culture-information

Hi,
 
I'm creating a web application with membership and such. And I have some problem figuring out how to store locale and culture data. My application needs to know the following three things for every user: country (or region), prefered language and their timezone. Now, the country and language can easily be stored as a CultureInfo string (such as "en-US" or "sv-SE"). However, i'm probably going to need two columns in my database if say a person lives in the US (and therefore applies to US registration fees, etc) but want the site displayed in swedish (my app implements global resources).
So i guess (if no one objects to the above) my question is how do I store the timezone-data? There is ofcourse a System.Timezone class, but I'm not sure how to implement it. I obviously want my site to display the correct local time (all datetimes are stored as universaltime though). Is there a "universal" timezone-standard?

 
Any ideas would be greatly appreciated.
 
/David N.