Glad this thread has re-surfaced, as I am in the middle of trying to sort out a lightweight compact camping solution, not for any trips longer than a couple of weeks, but I need everything to fit in a rucksack, so compact is the name of the game.
Currently experimenting with a hammock and tarp set up, using a DD Travel Hammock
. The thinking behind this is that the hammock has a waterproof base and built in mosi net, so even if there are no trees it can be used on the floor with the tarp over it to form a (sort of) tent. I have tried the hammock out hanging from trees and it is incredibly comfy, a lot comfier than any camp bed / sleeping mat that I have used. That said the privacy of a tent would still be nice, I like the look of that Gelert Solo set up posted earlier, I may investigate some small changes to my initial idea based on that (and available packing space).
I'm still experimenting with it all at the moment, if everything goes to plan I am planning on getting out and about next week (probably round Wales) to try it all out 'on the road', will post some pics and feedback afterwards.