Notes from Andrew Stillman at YouPD
Install doctopus from any Google Spreadsheet, though preferably one that you can use as a one-time roster for tracking a particular project with a particular group of students.
Install from the Script Gallery...accessible from the "Tools" menu in a Google Spreadsheet.
Currently, Doctopus is in the "featured" section of the gallery!
If you are unable to locate Doctopus in the script gallery, copy the spreadsheet linked (File->Make copy) below and it will already be installed on your copy.
Some things have changed since the first release of Doctopus:
Doctopus by jay Atwood
Goobric by Jay Atwood