Dandelion's root can be used to make tea or coffee. If i remember correctly you can eat the leaves...dont take my word for it though. Try it first <img src="/images/graemlins/laugh.gif" alt="" />
The inner bark of many a pine tree can be eaten, others are posinous. Confusing stuff. Same goes for their needle leaves, But with so many undigestable chloroplasts contained I doubt its worth the risk...

I'd love to learn more about nutritional, medical values of plants and learn to ID them. Hopefully this summer I will participate in a week long survival course and learn more then. Finding it too hard to learn from the books alone.