Hydroponic Edible Gardens for Urban Windows

I appreciate the intent but I do find it a little annoying that I had to register, agree to a vague TOS and then verify my email address to look at the guides. The guides themselves were ok, but I'm sure similar information can be found elsewhere on the Internet without having to hand out my email address.

We've been doing a lot of container gardening lately, and have been thinking about making a system like this.

The 'air lift' water delivery system looks particularly inteesting, but kind of Rube Goldberg-ish. I'd be very interested to hear experiences from anyone who has actually built one. How well does it work?