Oxfam are currently lobbying Starbucks on its failure to take seriously the requests of Ethiopian coffee farmers and the Ethiopian government. You can find more info and find out what you can do to help here:
http://www.oxfam.org.uk/what_you_can_do/campaign/mtf/starbucks_store.htm
There's also more info on how you can get involved with campaigning for fair-trade through Oxfam here: