Some of the topics here on LD4all can be very inspiring. These are some of the topics I like reading before sleep:
Favourite thing to do in a LD
Lucid ToDo List
Different styles of flying
Your most interesting dream
And I agree with Thorn, planning is a good thing. Some members of this forum actually writes down what they plan to do in their next LD. It has proven very effective. What have you always wanted to do?