How have your library organized?

I have it by genre, like FPS, RPG, Stealth, etc.

I try, but with so many games, its so hard

I´ve
Favorites - Games I play alot (Dungeon Defenders,Magicka,Dota2 and so on)
Humble - Games of the HumbleBundles (CoH, Binding of Isaac)
Multyplayer - Guess what games are here XD (Portal2, Cod, Arma 2)
Singleplayer - Half life and so on
aaannnd
NonSteamGames

My library is more or less organized by how I got the game.

• Bundle Fluff - I stole that label from someone on the SG forums. I forget who it was or they'd get credit. These are games that weren't part of the reason I bought the bundle. Found some really nice surprises in this category though.
• Bundle Goodness - Games that were the reason or at least part of the reason I bought a particular bundle
• Demo - Pretty self-explanatory.
• Freebie - Games I've gotten for free via non-SG means such as Faerie Solitaire, Portal, and a couple of others.
• Gifted - Games given to me by friends so I always remember their generosity.
• My First Steam Game! - Also self-explanatory. It's Magicka, for the curious.
• SG Lewtz - Fairly self-explanatory as well. Another category to remind me of the generosity of others.
• Games - The default category. Anything that doesn't fall into the above categories goes here.

like this

Completed and then everything else

installed and not installed

Adventure, RPG, Finished and all the rest.

Beta, Installed, Not Installed, Games i dont think i'll ever play.

Well, obviously one should organize his library in well thought-out and logical way. You should be able to find any game quickly and the categories must cover all the possible options.

Here is the categories I divided my library into:

• Games that have Batman in it
• Crane operator simulators
• Peanut butter-related games
• Games without Nolan North in VA-cast
• Games that involve blending
• Games in which protatgonist has amnesia and wakes up in some alley without money and document and any clue about whats going on and everything around is kinda cyberpunk-ish and then weird shit begins to happen and then some guy is like - hey, I'm Illuminati - and you can shoot red barrels and there is this cat or racoon or whatever the hell this thing is
• Miscellaneous
• Fortix

Does "alphabetically" count?

As it is originally

non-steam, games

What do You think about this variant?
http://i53.fastpic.ru/big/2013/0109/e7/c486daa0bff24f88242ba989f7fda7e7.jpg