Export Selected Projects is a free Things AppleScript which will allow you to quickly and easilt export all currently selected projects including their tasks to a text file.
Installation: Copy the .scpt file to ~/Library/Scripts/Applications/Things and go to the Script menu to select the newly available script.
How to enable the Script menu:
1. Launch /Applications/AppleScript/AppleScript Utility.
2. Check the 'Show Script menu in menu bar' if it's not already checked.
3. Quit AppleScript Utility.
Requirements:
ยท Things