wbmw: YB, errata are usually bugs with workarounds.
Both errata in question have workarounds. For the first one, a timing issue forces the chipset out of AGP compliance. The only workaround suggested is that the board design guide is changed to force an increase in mimimum trace lengths. Not exactly an elegant solution for a non-compliant chipset. Additionally it does pretty much pass the buck for an Intel erratum on to the board designer. However assuming that all boards are designed to the new guide requirements, it should not be an issue. It pretty much leaves early adopters, who have boards that were properly designed to the AGP spec that do not work right, in the cold though.
The second erratum is a no-nevermind as long as the user knows to disable AGP prefetch cache in the BIOS.
Not exactly earth-shattering flaws, but not FUD either.