Perkler!

Wilcox's old schoolbuddy Justin has set up this awesome website called Perkler.

You sign up, you list all the loyalty cards in your wallet (no disclosure of identifying details involved) and they collate all the perks you're entitled to but forgotten about, plus several others you might like to take advantage of but never heard of. It's kind of like LibraryThing, but for your wallet instead of your bookshelf, AND WITH MORE FREE SHIT.

Totally super.