Decompressing My Shoe Closet

I got rid of 18 pairs of shoes because they no longer fit in my closet. Living in a small apartment really pushes you to edit your belongings. Plus my husband keeps complaining of the stray shoes I have lying around... Probably half of the shoes I had to part with I've only used a couple of times. Of course, they went to a good cause :)

I use a bookcase (about 6 feet tall) for a shoe cabinet, because I can't afford to have a walk-in closet like Mariah's. I just covered it with an old shower curtain so it wouldn't be disgusting to look at, hehe...

Now this is what's left of my meager but much loved collection. Trimmed down significantly but still a little full. But seriously, I only have two feet, how many pairs could I possibly need?
I need to find a way to organize boots, they're awkward to store and takes up too much space when upright... Ideas anyone?