Asking your boss for a letter of recommendation is a big deal to him. Especially when you are one of the best workers. Your boss will try hard to keep you if you are worth the money spent. But if you got fired a letter of recommendation could help a lot. Here is a site you can visit to view more on this matter
. http://college-preparation.suite101.com/article.cfm/asking_for_a_letter_of_recommendation