UNC School of Government Professor Jessica Smith put out this Crawford Primer (Sept. 2012) as part of her NC judges benchbook series. It contains a good framework with flow charts on how to deal with Sixth Amendment Confrontation Clause issues under Crawford v. Washington and its progeny. Although it is somewhat tailored to North Carolina state courts, I'm linking to it here because it is based on general Confrontation Clause principles and should serve as a useful guide for federal court practicioners too.
Also helpful are the Crawford materials available at fd.org here.