I promised here that I will polish my library lookup script and post it here, but haven't yet found any time to do that. I am posting it here so someone could work on it and make it better...
I have tried to look for the ISBN in both SDCL and SDPL, and it inserts the message and the link correctly. However in some of the cases, amazon inserts some more elements inside the same div container, so the links appear much later. (not immediately following the title). I have an idea of how to fix this and am going to fix this very soon...
Get the LibraryLookup Greasemonkey script from here.
(Usage: RIght click on the link and select "Install User Script" from the menu. OR open it in forefox, go to tools/Install this user script, click ok and now on you will see if any book that you are browsing on amazon.com is in SDCL or SDPL!)
Update: 11/30/05. The new bookburro extension for firefox supports SDPL and SDCL libraries by default, I will not have to update my miserly scripts now...