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Gavin Andresen's post-mortem of the March 2013 fork: a block that 0.8 nodes accepted and some pre-0.8 nodes rejected, the Berkeley DB lock limit behind it, and the fixes that followed.
On March 11, 2013, one large block split Bitcoin: v0.8 nodes accepted it, older nodes rejected it. Developers chose the shorter chain every version accepted, and two pools downgraded to rejoin it.
An integer overflow (CVE-2010-5139) let Block 74638 create 184 billion BTC. Satoshi released a fix 5h 40m after discovery; the fixed chain overtook the bad one about 15 hours after the block.
How the 2010-08-15 overflow incident unfolded: the soft-fork rescue, why a 5-hour response was possible only then, what the transactions themselves show, and the centralization paradox.