Books in a series and having to wait

Don't you hate it when you are reading a book and it's part of a book series and you have to wait FOREVER for the next book to come out.  Then you get the next book and you can't remember where it left off?  Well I saw this a few days ago on another blog, I can't remember which one but thought it was a great idea.  I'm going to summarize a book in a series that I've read so that when I get the next book I can look at my summary and know what happened.