10.6.4 Combo Update fail, as do updates to iTunes and iPhone

Question

I seem to have a larger problem here with updates, but for now I'll focus in on the 10.6.4 update where my efforts are centered.
I have tried 3 times to update my 10.6.3 machine to 10.6.4 (no, I don't have a SMART board and my maxfile limit is just fine, thank you).
Instead, I get the following error in the "install.log" file:
Aug 13 21:29:23 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[289]: PackageKit: Install Failed: PKG: extracting "com.apple.pkg.update.os.10.6.4"\nError Domain=PKInstallErrorDomain Code=110 UserInfo=0x119160430 "An error occurred while extracting files from the package “MacOSXUpd10.6.4.pkg”." Underlying Error=(Error Domain=NSCocoaErrorDomain Code=259 "The file couldn’t be opened because it isn’t in the correct format.") {\n NSFilePath = "/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root";\n NSLocalizedDescription = "An error occurred while extracting files from the package \U201cMacOSXUpd10.6.4.pkg\U201d.";\n NSURL = "MacOSXUpd10.6.4.pkg -- file://localhost/Library/Updates/zzz061-8419/061-8419.English.dist";\n NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=259 \"The file couldn\U2019t be opened because it isn\U2019t in the correct format.\"";\n PKInstallPackageIdentifier = "com.apple.pkg.update.os.10.6.4";\n}
Aug 13 21:29:31 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[289]: Error: An error occurred while extracting files from the package “MacOSXUpd10.6.4.pkg”. (PKInstallErrorDomain code 110)
I've downloaded fresh copies of the 10.6.4 Combo Updater 3 times, and even the .dmg file reports that it is corrupted and it won't unpack the thing.
Since I think this is a larger issue (I cannot get iTunes 9.2 and my iPhone 4.02 update just bricked my new iPhone) is there somewhere else that I can look?

Answer 1

Aw...shucks! Limiting the package scope did NOT work either.
-------------install log---------------------
Aug 14 19:07:08 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: ----- Begin install -----
Aug 14 19:07:08 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: request=PKInstallRequest <2 packages, destination=/>
Aug 14 19:07:08 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: packages=(\n "PKJaguarPackage <file://localhost/Library/Updates/061-7365/AirPortUtility.pkg>",\n "PKLeopardPackage <file://localhost/Library/Updates/zzz061-8420/MacOSXUpdCombo10.6.4.pkg>"\n)
Aug 14 19:07:18 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: Skipping component "com.apple.RawCamera.bundle" (3.0.3-529.0.0-5290000-*) because the version 3.3.0-533.0.0-5330000-4 is already installed.
Aug 14 19:07:22 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: Skipping component "com.apple.CoreFP" (1.7.16-1.7.0-10716-*) because the version 1.8.23-1.8.0-10823-2 is already installed.
Aug 14 19:07:41 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: Extracting /Library/Updates/061-7365/AirPortUtility.pkg/Contents/Archive.pax.gz (destination=/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root, uid=0)
Aug 14 19:07:47 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: PackageKit: Install Failed: PKG: extracting "com.apple.pkg.update.os.10.6.4.combo"\nError Domain=PKInstallErrorDomain Code=110 UserInfo=0x115b8b320 "An error occurred while extracting files from the package “MacOSXUpdCombo10.6.4.pkg”." Underlying Error=(Error Domain=NSCocoaErrorDomain Code=259 "The file couldn’t be opened because it isn’t in the correct format.") {\n NSFilePath = "/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root";\n NSLocalizedDescription = "An error occurred while extracting files from the package \U201cMacOSXUpdCombo10.6.4.pkg\U201d.";\n NSURL = "MacOSXUpdCombo10.6.4.pkg -- file://localhost/Library/Updates/zzz061-8420/061-8420.English.dist";\n NSUnderlyingError = "Error Domain=NSCocoaErrorDomain Code=259 \"The file couldn\U2019t be opened because it isn\U2019t in the correct format.\"";\n PKInstallPackageIdentifier = "com.apple.pkg.update.os.10.6.4.combo";\n}
Aug 14 19:07:48 Aka /System/Library/CoreServices/Software Update.app/Contents/MacOS/Software Update[429]: Error: An error occurred while extracting files from the package “MacOSXUpdCombo10.6.4.pkg”. (PKInstallErrorDomain code 110)
Running a 10.6.0 virgin install has clearly not helped. Downloading combo updates isn't working. I'm pretty much screwed and royally ****** at Apple right now (almost enough to spend my night typing a detailed bug report on radar).
Any other ideas? Genius bar and make them suffer? Wipe my drive and re-install off my backup and just run 10.6.3 forever?