Mark Jeffrey's Max Quick: The Pocket and the Pendant was original published as a podiobook. I listened to the podiobook several years ago, and recently read the paper version.
Jeffrey has said that MQ1 required substantial rewrites, many of which set things up for the two sequels better than the original version did.
I didn't notice any changes reading the paper version (but it has been a long time). Is there a list of substantial changes (i.e. changes in the plot or characters, rather than just editing) available somewhere?