Real World, Specific Problem Design Patterns

Maybe that's not the right terminology for what I'm searching for...

Are there any resources / books / etc that deal with design patterns for specific common tasks? Or maybe it's more of a "How things work" information. A few examples:

Discount / Coupon Systems Shopping Cart System Subscriptions

Of course half the fun is figuring out this stuff on your own, but it's nice to see other peoples' ideas...