Last Friday I posted my 90,000 card. The majority of the commenters (2 out of the 3) wanted to know how I organize these cards. We have a spare bedroom which has been designated as my den that has a nice sized walk-in closet. about 2/5ths of the available space in the closet is devoted to baseball cards.
I actually did a post on this topic back in December 2008 here. But that was a lot of cards ago. My organization hasn't really changed but here are some updated photos.
Here's a better view of the closet.
Players I Collect go in 3 and 4-inch binders. I've acquired a lot of binders over the years. Some I've bought, some were discards from where I used to work. I prefer D-ring binders because you can stuff them pretty good without the edges of the pages getting curled into the rings. And I prefer 3-inch binders because a full 4-inch binder is really heavy. Here's just a short row.
I keep one card of each type I have in what I call my reference binders. These also contain all the relic and auto cards I have. Except for Phillies and Astros. These I keep in the Phillies or Astros binders.
Finally, I keep Phillies cards and Astros cards since 1995 in binders. Here's most of the Phillies binders.
These are all stored on some cheap shelving units I bought from Ikea. I'm surprised they haven't collapsed by now.
So that's what my 90,000 cards look like.