I've used an interactive word wall with all of my classes for the last two years. I've found it to be an invaluable way to keep key concepts at the forefront of students' learning. My word walls are interactive in that we use the concepts on the wall regularly for a variety of purposes. Some days we use the words on our interactive word wall to summarize what has been learned, other days we use the concepts to ask questions or to extend our learning as writing prompts. I love the ease and flexibility with which interactive word walls can be used.

Here is a link to my classroom blog where I explain the use of this strategy in connection with William Shakespeare's Romeo and Juliet and Harper Lee's To Kill a Mockingbird.

Here are is a picture of an interactive word wall and some student products gained from using the interactive word wall:
Prefixes and definitions for students in a freshman English class.

Student created operational definitions of vocabulary words from Laurie Halse Anderson's novel Speak.