The Delicious Library concept is smart - it creates a catalog of all your possessions and arranges them on its aesthetically pleasing interface. By far their best achievement is in their visual design; they've made it fun to look at it and (apparently) easy to use. As we all know, smart design is what separates great services from annoying ones
Read the description on the main page and tell me if you're intrigued. The two main functions of having a "catalog" of what you own seem useful to me... to remember if you loan something to a friend, or to have a complete list to give to your insurance company in case of an incident.
It costs $40. Would you use Delicious Library?