Take a few minutes and follow through with the following:
Windows and Mac OS X: Offered as a free download from the Insurance Information Institute, the Know Your Stuff Home Inventory software is a full-featured tool for cataloging your possessions in case disaster should strike. Wizards guide you through the basic setup of your inventory, then using Know Your Stuff's simple interface you can add rooms and items to the inventory. For each item you enter you can assign photos, receipts or appraisals, make/model/serial number, quantity, and replacement cost.
There are guides to help you get started on the Know Your Stuff web site, very helpful if you've never done a home inventory before and aren't sure where to start or what to include in it. Obviously if you invest the time and energy to create a home inventory you'll want to make sure the it's is secure. From the Know Your Stuff application you can export the file you've created and save it to external media or to a remote location, upload the file to Vault 24 (a remote backup solution integrated into the software, which unfortunately costs $15 a year) , or you can go the old fashioned route and print the inventory off and store it in a safe location. The Know Your Stuff Home Inventory software is a free download for Windows or Mac.