How do you store and organize your leftover keys?

I just use an email to myself as a perpetual notepad.

Bundle Name - Platform - Game Name - Key

I don't... Mans don't organize!

I use Google Docs Spreadsheet. It is the best way to go. Auto-save, stored online, backup. Everything you need. :D

I just simply use notepad and save it on my desktop.

17 tab Google doc spreadsheet...

I shove mine up my friend's throats

I use Evernote.

I made a simple database that lists all the keys and have a field / flag to set them to used and sort the list so that it shows me the unused ones

txt file on desktop named STEAM KEYS.

Another notepad user checking in. Simple format of:

Steam keys
Game name - key
Game name - key
Game name - inventory (I list them too)
etc.

Seperate little sections for Desura and Origin keys.

I go to my email template folder, Edit as new, put the details in for the name + key, save. My drafts folder is full of keys ready to give away when I feel the urge.

I dont. I just search my email for terms like "indie" "humble" "bundle" "keys" "games." And then I search those links for my left over games. It is much more fun that way. On several occasions, I have gone back and to my surprise, there would be new keys there that I didn't have (new developer keys). It is much more fun and exciting this way.

Since HB is the only bundle i buy, (sometimes indiegala but really sometimes) y just have mi user with all my libraries there.

Soo... ok.

I have them all in HB site.

I keep a .txt file, only organization I do is separating Desura (31824-BD48F-DC885-6AA9F) and Steam keys.

since i store all my passwds in an encrypted keepass2 database, i just throw them in there, synced via dropbox
offers all the features of the other methods mentioned + more safety :)

LibreOffice spreadsheet, with many columns (and filters): game, platform, key, source (steam, specific bundle) + link, availability, ... ^^

I like to store my keys in the steamgifts forum...