Was looking at under the hood and I see that Jodi Thomas'  The Widow of Wichita County  shows up on the screen with a large red W.  I think, hmm, I didn't know that was a wishlist book.  I've had it my shelf since I became a member...  so I search for it and it says- post this book.  Yet when I add it to my reminder list it shows 19 copies in the system.  If it is a wishlist book,  why hasn't it been requested off my shelf??

I see a Hardcover, Large Print version of the book with no copies in the system; all other versions I can find available for order. The Wish List system goes by exact ISBN, it won't match your paperback to a wish for a HC.

Generally if there are multiple copies of one version of a book and then a WL for another version then those people really want that version. Especially if the posted one is paperback and the WL is for large print, audio or hardback.  Many people need lrg print and others like hardcovers for their keeper shelves.

I was wondering about this myself.  I looked it up in the help docs....and found -

Similar to Wished-for" items

• Different versions (ISBNs) of a title are usually linked in the database
  • non-ISBN items are not linked to any other item, even if the title is the same
• When one version (ISBN) of a book is Wished for, and an alternate version (ISBN) is posted:
  • ALL members who have a "similar" item (same title, but different ISBN) on their Wish List will get an auto-email alert from PBS.
  • This "Similar-item" email alert is NOT the same as a true Wish List offer: it will not be an exclusive 48-hour hold; it will be offered on a first-come, first-serve basis
  • Members who want a specific version (ISBN) of a book should not request the "similar item" when they are alerted to it.
  • The "similar-item" notification emails can be turned off in the Email Settings in the Settings tab in My Account.
  • Responding to a "similar-item" alert and requesting that book from the alert email will NOT remove the original ISBN from the requestor's Wish List.

 and they are changing how the wish list works:  http://www.paperbackswap.com/help/search.php?terms=book+is+on+wish+list+but+mine+is+not+selected