Earlier this year, AMD faced a nasty CPU bug that required them to hold off their processors until new ones with some necessary workarounds became available months later. As you know already, this hit AMD pretty badly.
It was hinted Monday that they weren't alone in this situation and that Intel's Nehalem core had also been identified to be suffering from a TLB bug. The news widespread quickly but within the same 24 hours Intel came to respond and clarify that none of the shipping Core i7 processors suffer from any troublesome errata.
According to Intel's version, they did discover some issues before Nehalem's release, all of which were resolved via BIOS updates before launch. In fact, related issues were also found in Core 2 Duo processors back in the day, but we never heard anything about this because, again, it was all sorted ahead of release.