During the All Star break Dave Cameron from Fangraphs publishes his trade value series. It is one of my favorite articles to read every year. The whole premise is coming up with a list of the most valuable trade assets in baseball. It is subjective by nature, but it really is hard to argue with the results.
Here is a link to the top 10. You can find links within this article to see how the whole list.
Every year it really just proves how awesome Mike Trout is. It is a shame that the Angels are wasting the inexpensive years of a once in a generation talent.