Managing manuals and home inventory

With so many technical products around, I find it hard to keep track of the manuals. Even when I find it, the information in on paper... What a waste of time.  Many manuals are now available online directly from the manufacturer's website. Some valiant souls have started websites designed to help you locate manuals and other details about products you own. They also keep track of your inventory. 

• Sample: My Brother All in One Printer MFC-7840W. By the way, this is a great 4 in one printer.
  http://personafile.com similar products.
  More information about this product's life. Brother - Wireless Black-and-White Laser Printer/ Copier/ Scanner/ Fax
• Another source: User manual BROTHER MFC-7820N - User guide BROTHER MFC-7820N - English - Diplodocs