After some feedback I have updated the SP-Upgrade script created 2 weeks ago. First there was a bug in the script related to the export of Web Application names and then I added switch that makes i possible to only export the content database information to an XML File. This is how the help looks now and you find more information about the script here: http://mysharepointofview.com/2010/03/automate-sharepoint-patching-with-powershell/

SYNTAX:
SP-Upgrade -help
Displays the help topic for the script

SP-Upgrade -Binaries
Installs the wss and MOSS Binaries on the local machine

SP-Upgrade -Binaries -DetacheContentDBs
Detaches all content databases and installs the wss and MOSS Binaries on the local machine

SP-Upgrade -PSConfig
Runs the SharePoint Product and Configuration Wizard

SP-Upgrade -PSConfig -AttachContentDBs
Runs the SharePoint Product and Configuration Wizard and attaches all content databases

SP-Upgrade -OnlyAttach
Attaches all Content databases found in ContentDatabases.xml

SP-Upgrade -OnlyExport
Exports all Content databases found to ContentDatabases.xml