I am acquainted with one of the developers of drip tape irrigation systems. He indicated that John Deere is the distributor for the design he worked on.
Check out:
http://www.deere.com/en_US/water/pro...cts_ttape.html
I have seen the drip tape and attended a brief presentation about it, but have not yet used it myself - I would also be interested to hear from others who have used it.