Text Rain
Camille Utterback and Romy Achituv's "Text Rain" demonstrations (note: no audio), way back in 1999, showed some possibilities for interaction between texts and readers/rewriters.
The words themselves are almost beside the point (they form a poem, the designers later tell us). What matters is the sheer joy of interacting in this method.
Utterback and Achituv's work functions primarily as an interactive art installation. What happens to us when texts react to us an everyday basis? What's going to happen when we stop noticing that they're watching us?