I saw this thread and I thought you might be interested in this article called:
“What’s Really Kosher at Starbucks?”
http://www.communitym.com/article.asp?article_id=100536
The author is makpid and did extensive research. Of course, she is not a posek, but the article merely opens your eyes so you realize what is questionable. She says don’t rely on her info too, but ask Rabbi….drinks for thought.