script kiddies (also known as skid, script bunny, script kitty)

Someone got it already (wasn't me)

Someone got it. Thanks though.

Sorry, some ninja grabbed it :P

Bots can't do it. Firstly you can't store these keys as they have to be redeemed immediately else someone else can take them. Secondly there's no web interface or public API to redeem Steam keys, you -have- to do it through the Steam client which a bot wouldn't really be able to do as you'd have to have something interact with the GUI itself, wait for the windows/pages to update, etc. Not to mention if it's trying any old key then the account would get locked out for an hour every time it exceeded 5 attempts.

Whilst bots aren't technically impossible, it would require a -lot- of technical knowledge across several different technologies so it's very unlikely.