Raistlin, the evil mage is the master creation, W & H obviously knew this, they've written a whole trilogy about him.
Alot of the dragonlance series storylines and history of krynn are stolen from tolkien, and to me, to coin a Stephen King phrase - Wiess and Hickman are the Big Mac n' Fries of fantasy writers.
I first read the dragonlance series when i was 14. I am now 31 and decided to read the twins trilogy again, as I had remembered prefering them to the first trilogy. The first time round I was enthralled and couldn't put the books down. Now, it is more lesuirely reading but still great fun. I don't know about anyone else, but personally, anything W & H wrote after the first six books were poor in comparison, e.g the heroes trilogy was absolute Trash.