Humble bundle once again - they're now doing a weekly bundle.
Now to piss off everyone as you'll already have them - for just $1 you can get Red Orchestra 1/2, for $2.91 (this may vary) you also get the Killing Floor.
http://www.humblebundle.com/weekly
Six days, three hours and 42 minutes remaining.
OK, I've just bought them for $3 (£2.05), but I've already got RO and RO2 - anybody want these Steam keys?