If you need to inventory the total number of items you own for insurance appraisals or to simplify your life by eliminating clutter the free webapp iKeepm allows you to keep track of each item in each room. As you populate the list with each item's make, model, serial number and value, a total household value is displayed in the corner.
It's surprising how much stuff we own, and even more so how much we paid for most of it. If you own a home or have contents insurance, having a detailed list will help if you're ever the victim of theft or natural disaster and have to start over again.
The web app is currently in beta, so expect a bug or two. I logged all of the items in my home office quickly (only because I didn't take the time to find the serial numbers). You can generate reports by room or item type. Other options include adding photos of items and exporting your data into a comma-separated values file.
The site isn't flashy, but it seems to work fine for it's intended purpose.