I think we might have discussed this before, but I'm really happy with my setup (credit to the previous owner!).
On the left side of the airplane, I have shelving for books, charts, etc. While we all carry fewer Jeppesen binders around, there are still avionics manuals, the AFM, a binder containing flight logs and maintenance items, etc. I also carry some paper sectionals for the areas where I fly, and paper enroute charts for the US and Canada. All of that fills the shelving pretty well.
On the right side, I have the standard cabinet that my airplane came with. It has two main drawers, and a small compartment on the top, along with a place to set a cup. The lower drawer has an ice chest, which I use for bottled water (I do put ice in it during the summer, to keep the water cold). The upper drawer, which is pretty large, has cups, a few snacks, sugar, creamer, napkins, etc. On top of the cabinet is a little compartment which opens up from the top, and has a mirror on the inside, and I have playing cards, mints, post-it notes, that sort of thing. When I leave home base, I usually drop my home/hangar keys in there so I won't lose them.
I usually carry a thermos of coffee behind the copilot seat.
Finally, I have a little mini trash can, which goes right behind the side facing seat, between it and the aft-facing seat.
When the airplanes were new, the drawer module was about the same, but behind the pilot seat the cabinet had two large thermoses, a small cup dispenser, and an ice drawer. There was a little trash can which attached to the cabin door.