Almost every household seems to have a stockpile of instruction manuals and warrantees forms. Here's 3 ways to keep them organized. ...
Physical space saver
Download the pdf manual
Scan the receipts into a specific folder ie Warranty & Receipts + room & year
Toss the paper
Keep recent purchases
Recycle if the warranty has expired
Online all the way
Most manuals are available online.
If you have any concerns check online before you toss them into recycle.
When you need to reference them go online
Some visual people prefer to keep the printed version. If you are or will be selling you home, home buyers consider sellers with a organized bin or binder of instruction manuals to be buying from someone who has a greater attention to caring for their home.
Gather them together
Sort by function / room or by brand
Make sure you actually own the item
Ziplock contents together so they don't get mixed up or alternately store them in page protectors
Quick label with thick green tape and large writing
Arrange them alphabetically
Store in a filing cabinet or bin or binder
As soon as you purchase an item you need to keep track of, be sure to write the purchase date on the manual or copy the receipt and attached it to the manual.
Review annually and recycle any unnecessary manuals.
Super tech savvy folks might consider Evernote to store manuals.