Well, if you are willing to work with a time scale a couple magnitudes slower then we currently do, then it is rather practical, sure it takes a few million yea

Well, if you are willing to work with a time scale a couple magnitudes slower then we currently do, then it is rather practical, sure it takes a few million years to transmit, but if I think at that speed too then it is not a problem. Heck I'd use a group giant balls of flaming gas as a transmission medium, then encode data as the pulses of their supernovae. Anything with eyes could receive the data, luckily I would also use RSA encryption and it would sound like noise to everybody else ;p