TITLE: A down-to-earth introduction to the uses of derived categories
QUESTION [43 upvotes]: When I was learning about spectral sequences, one of the most helpful sources I found was Ravi Vakil's notes here.  These notes are very down-to-earth and give a kind of minimum knowledge needed about spectral sequences in order to use them.
Does anyone know of a similar source for derived categories?  Something that concentrates on showing how these things are used, without developing the entire theory, or necessarily even giving complete, rigorous definitions?

REPLY [2 votes]: "Derived Categories summer graduate school" is also a very good introduction.