2009-8-30 Upgraded to Snow Leopard (MB404).
Snow Leopard DMG (10A432) restored to a partition on iPod Video (10G, APM partition type), and then use iPod to boot and upgrade.
Everything seems fine.
Aftermath:
1 locate-db has to be reinitialized.
$sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist
2 Macports
Reinstallation of all ports seems to be a must.
Do as MacPorts Migration guide suggest. (Refer to http://trac.macports.org/wiki/Migration).
This does not work.
$sudo port upgrade --force installed
Instead all ports are uninstalled first, and then the whole /opt/local tree is removed, and reinstall Macports 1.80.
