I am addicted to the HGTV Channel and they have some great landscaping shows. Here's some good info:
Landscaping Design Tips
Also, just yesterday I was watching a local access channel and they had an amazing show on a couple who are energy green, including their landscaping. It was so cool. Wish I could reference it for you heer now, but it was such a local access thing that it didn't beat me over the head as to what the show was. No commercials either. Whoot for local broadcasting.