Now that I have a growing family, I'm more interested in flexible, expandable, and cheap shelters to fit ever changing needs. Having a commercial tent to meet car and wilderness camping for 1, 2, or 3 people is an expensive proposal. We had a successful two weeks of bike-camping in Belgium/Luxembourg this summer using a 3mil Plastic sheet (3mx4m) for 3.
The following link is well known, but I found it very helpful, to say the least.
Another I just found, which though not original, is inspirational:
BTW, the randonner-leger site is quite nice, and gives a window into the movement in France (as our other French members will attest).