KiiTag is a new product that provides "smart" tags to attach to important items. These tags can be located via BlueTooth from your smart phone/tablet. They are physical tags that can be moved from one item to another as the need arises. Tags cost about $20 each, but could be worth it to find items that are really impotant to you.
To learn more:
Article from USA Today:
Webpage of the Manufacturer (lifensoul):