Resources discussing the claims of genetic entropy in general, including the oft-cited H1N1 paper by Sanford and Carter. For resources specifically on that paper, see below.
Claim CH320: Life is deteriorating
Claim CH321: Parasites are degenerations of free-living species
Brief responses in the Index to Creationist Claims in the TalkOrigins Archive.
Creation Myth: Genetic Entropy
Video by biology professor Dan Stern Cardinale on his Creation Myths YouTube channel. Cardinale has also produced an abridged version called 5 Minute Myth: Genetic Entropy. He has also produced the following video: Responding to Critics: Price, Carter, & Sanford on "Genetic Entropy".
A letter by old-Earth Christian Scott Buchanan to a young-Earth creationist friend named Stan, published on his Letters to Creationists blog. The second half deals with John Sanford’s book Genetic Entropy. At the end is a link to a page containing Buchanan’s responses to Sanford's defence.
Genetic Entropy. We're all DOOMED! - Creation Today claims
Video by Paulogia.
Video by Jackson Wheat.
Video in the How Creationism Taught Me Real Science series.
Creation Myth: H1N1 and Genetic Entropy
Video by biology professor Dan Stern Cardinale on his Creation Myths YouTube channel, showing various major problems in the H1N1 paper by Sanford and Carter, which is often cited by creationists as evidence for genetic entropy.