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An alternative to a specific object is the use of a standard communication protocol. The TUIO protocol has been specifically developed for multitouch devices. It uses OSC messages (with specific tags) and generally OSC messages are transmitted trough Ethernet or wi-fi. However as far as I know this 3M display cannot send TUIO messages.
I'm thinking too to buy very soon one of those great multitouch screens to use your MMF in max to edit my complex max sound synthesis full of sliders and multisliders...
But a also another more general question about multitouch screens to use as a musical instrument: Does somebody knows any big multitouch screen that is nicely sensible to the "SIZE-AREA" feature of MacBookProTrackpad/fingerpinger and iPads ?