Although it's not confirmed by Blizzard yet, the data-mining gurus over at MMO-Champion have discovered that the bind-on-pickup restriction on WoW's trading card "loot" items may be a thing of the past in the upcoming patch 3.2. According to this thread, the coveted Spectral Tiger and other loot card items don't have the BoP restriction in the current 3.2 public test realm.

If it's a legit change, it's one that was probably made by Blizzard to deter all the "loot card scams" that seem to have skyrocketed in popularity throughout the last few months. If the item could physically be put into the trade window, most scammers wouldn't be able to get away with their current scheme, which relies on the buyer to trust the seller when they say, "Yeah, just mail me 20,000 gold and I'll mail you back the loot card code!"