Two music chains – FYE and Coconuts – have come up with a very effective advertising technique. These two music stores use Bluetooth technology to send people messages on their Bluetooth phones as they walk into the store. You may see special deals or hot items in the store because you allow the companies to send you these messages. You have to agree to accept the messages first. So, you’re not just going to get spammed all of a sudden. Sending private messages to people is also the idea behind DING, an airline technology currently being used by Southwest. DING lets customers know when an airline sale pops up. It even sends those people customized airfares based on the typical prices they pay and their travel patterns. In other words, airlines are able to offer one-person sales instead of sales for everyone. It’s all done through data mining and it’s going to get bigger. Northwest is also experimenting with a system that sends people special, private deals. We’ll keep you posted.