Minitel terminals are plentiful and fun to play with.

A great first project is to build a serial interface and connect your Minitel to a PC. Here are some resources to get you started:

In the classroom, Julien and I have been using the Minitel to display a teletext-style "slide show." For more info, see our Arduino code repository:

Another fun project is to use your Minitel as a dedicated Twitter terminal! There are many ways to go about this but here is one of the best tutorials: