Sounds like a great idea to me.
Just about every comic book could use a summary. Of course, it would be better (for us readers) if it wasn't a separate issue in itself. I'd rather see summaries tagged to the end of annuals, or just any old issue once a year.
Oh, and I'd like to see the summaries cover more than just a year. Give me all or most of the info that would be good to know for the next year of that title.