Arduino can send and receive OSC formatted messages and data (see for example, d.tools for Arduino: http://hci.stanford.edu/dtools/arduino.html). However, most (all?) programs expect OSC messages to arrive over UDP, not a serial port, and so you need some program in-between to transfer messages across. Monome has a program that does something like this (http://monome.org/data/app/monomeserial), but you'd need to use their protocol for the serial communication.