i've lost track of the days left and realized there is now only 28.... catch up time!
day 30 .... found me listing the last pieces of furniture that will be for sale on craigslist ...
here's a few with their links

By having this on hand, be it in the glove box of your car, your purse, man bag... whatever the case may be, it can save you a ridiculous amount of headache and second guessing.
You will want to include basic information like the size and layout of your rooms, color choices (fabric swatches are perfect for this!) and sizes of existing pieces of furniture.

Other things that might be helpful are window heights (in case you are curtain shopping), height from the floor to the bottom of your window (in case you need something low to fit under it), and the location of your electrical outlets and floor vents (which are things we rarely think about, but end up being a pain later on).
Don't worry if they are hand drawn, they are only reminders of what's back at home, although if you want to wow the sales associates, feel free to Photoshop until your heart's content.
You can also laminate your layouts so they are spill resistant, although a note of caution, the color scanners at the hardware stores, are unable to mix paint accurately if they have a coating on them. If you would like that extra layer of protection, consider putting your paint chip on the ring lose so it's able to be used when needs be.
All of these things are nice to have on hand, so when you find "the perfect piece" you will know before you get it home if it will really work in your space."
I do have one thought to add to this. Being such a visual person, I think I would also include a photo of the room.