Bill Ingle, of Beecham Research, posted a very interesting take on SCADA from the M2M perspective. In case you've forgotten what M2M stands for, it is Machine-to-Machine. I won't say I agree entirely, or even a lot with Ingle's take, but I think it is worth reading.
Read it here:http://www.beechamresearch.com/infopage.aspx?pageid=33