I tried to go to petsmart.com thru the sponsor link at the top of the page and it didn't work. Maybe its just me but I thought I'd mention it here in case it's not.
I just did some testing on this, and the Orthopedic Window Sill ad works, as does the general Petsmart ad (at least the link on that one), but the Soft Claws ad does not work. Hope this helps!
Thanks for checking! Anyone else has had problems with those links? They are working for me - so please let me know what system you are on and also what do you get when you click on them.