flapjill - have you checked out Square Foot Gardening book? He has a great idea for trellises. I have made them. You use electrical conduit piping, cut into 6' and 4' sections (it comes in 10' sections, which is convenient), connect them with 'L' shaped joints to make 3 sides. those are ridiculously sturdy and you can then tie trellis netting to it. You have them in teh ground just on rebar poles that are hammered down. You can move them all over the yard very easily. He explains it all very well in the book. A little investment, but really not much. You can disassemble the whole thing when it's moving time. I made a set of 4 and then left them in my house, 2 houses ago, because I was moving to an apartment and thought I wouldn't need them for a while ... so of course I had to move again, and this time to a house where I would love to have them again! oh well, the new owners of that house are getting good use of them

On another note, my eggshell planters didn't work nearly as well this year as last! Everything just ran out of root room too fast. Not sure what i did differently last year. I had to start all over and plant in more normal-ish things (random plastic containers). I did grab a cool book on Greenwood Building at a yard sale this weekend and already built a trellis and a super cute fencing for my strawberries. No pics of the fencing yet, but the beginning of the trellis (it's pretty rough - a first attempt for sure!) pic is on my blog:
http://root-children.blogspot.com