FTD. The business behind selling and delivering flowers is a great business. Here is why:

 
No Overhead.
They team up with local flower shops to supply and send flowers.  Yes you heard right.  One of the biggest flower businesses never actually grows or stores any flowers.

 
Great for Florists.
Why wouldn’t you want to team up with FTD? They send business your way!

 
 Great marketing.
I see tons of ads for FTD. When I think of flower delivery, I think FTD.  (It also helps that they started in 1910).

What other businesses are like this?
Beer of the Month Club (BOTMC)
This business is actually way better than FTD. Beer vendors pay (or sponsor) BOTMC to send beer to their members and then BOTMC also charges their members to get a new beer every month!

HostelBookers.com
Created a massive network of every Hostel and created an interface to easily book hostels.

SkyMall
If you have ever been on a plane you know what this is.  An inflight magazine that showcases interesting products to sell.

Hotels.com (or any hotel/travel booking site)
They figure out which hotels have empty rooms, cut a deal with the hotel to give you a lower price, and take a cut of the entire process.

The hardest part of all these businesses is you need to get the network.

Do you know any business like FTD?  Let me know in the comments.