Sandi,

There may be a few good resources to be found by scanning through the following Google and dmoz directories. The resource sections of each web site listed may hold some good ones...
http://tinyurl.com/ojfq7
http://tinyurl.com/zvfed

Although, it's probably best to research each ethnicity and culture individually whether it's involves markets for Hispanic, Asian etc.

One of my favorite marketing sites that has some excellent articles covering ethnicity and cultural patterns is...
http://www.marketingprofs.com/

Some stuff Free and some not and a good search box with 194,000 marketing professionals.

Searching out and reading those articles will lead you to some Great resources.

And for those interested...
There's a Ton of money to be made Focusing on Keywords related to multicultural markets.

Phil