This is a very good Humble Bundle.
I had been interested in Darksiders for some time, but never looked too far into it but at $6/£3.87 (which I paid) I couldn't say no. I already have the CoH Anthology so was a bit bummed that Metro/Darksiders/CoH/RF:A are all one code and couldn't trade the spare CoH.
Also it'd appear that there isn't an option to download a DRM free version of the games - they have to be done through Steam. Not that it bothers me greatly, but I know a lot of people feel strongly about having all their games tied to DRM-related programs. I do hope that it's just a one off though because I did get previous Humble Bundles and they had standalone download versions.