This is available in GNOME's CVS:
http://cvs.gnome.org/viewcvs/tomboy/Tomboy/Plugins/NoteOfTheDay.cs
** Changed in: tomboy (Ubuntu)
Importance: Untriaged => Wishlist
Status: Unconfirmed => Confirmed
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No Note of the Day plugin in Ubuntu's Tomboy
https://launchpad.net/bugs/56620