The replacement (or best equivalent yet) is Mathais's (smile67's) Availability Tool. He runs aeroplan.de which is what seatmap.com front ended into. You can check out all the banter in the Miles Buzz at
http://www.flyertalk.com/forum/Forum1/HTML/009504.html
You can download the tool at:
http://www.stud.ntnu.no/~hartberg/ft/SabretoolSetup.exe
Setup is in German, but I think most of us know which buttons are yes and which are continue.