Smart playlist for unread audiobooks?

Hi all,

Is there a way in iTunes 8 to make a smart playlist that will track which audiobooks that I've started but not finished yet?

It is my understanding that iTunes tracks three states of iTunes tracks:

* New - Never read or opened with its track time marker set to zero.
* Unread - Started but not completely played through.
* Read - The track has been completely played through.

My audiobooks time to be large chapterized files. If a book is greater than 8 to 9 hours, the book is split into two or more tracks depending on the total book length. When I finish a book or book part, I uncheck it to indicate that is read (listened to) and to remove it from my iPod. I only keep my very, very favorite audiobooks on the iPod after they have been read.

AFAIK, there is no smart playlist field that indicates the new/unread/read status of a track. I currently maintain a normal playlist of books that I am currently reading but I'd like to see if this can be automated. Yes, I could use a keyword like "reading" in let's say the group field and then remove the keyword when done but this isn't much different than maintaining a regular playlist.

Any help will be appreciated.

Thanks,
Steven