This is a wiki to keep track of changes people will need to keep in mind when they upgrade.
5.x-1.x to 6.x-1.x upgrades:
Be sure to read the 5.x-1.x to 5.x-2.x upgrade guide since it will apply to your situation as well.
Settings Page Location:
The settings page has moved to improve usability.
So, admin/settings/pathauto
is now admin/build/path/pathauto
and is a tab under "URL aliases" called "Automated alias settings"