Yes, the combination would be interesting. Lot of projects in our new media/intermedia/interactive art lab use Arduino for interfacing with buttons, ultrasound

Yes, the combination would be interesting. Lot of projects in our new media/intermedia/interactive art lab use Arduino for interfacing with buttons, ultrasound sensor, pressure sensors and similar gizmos, while using normal PC for logic or video playback on projectors or something. Raspberry is capable enough for that (though I'm not sure the artists would be happy hacking it in python instead of Processing ;) ), pc's are big and ugly and having two miniature computers doing the whole thing would be really cool. It would also make sense for (noncritical) monitoring systems, where Arduino can interface with pretty much anything, and raspberry could either display things on monitors, or make a web page for remote monitoring, no problem. (you add ethernet to Arduino and run web server on it, sure, but I would never do something that horrible to the little ATmega.)