The article pages are somewhat responsive, while the index pages are not. I think that's a nice balance. I've always found responsive designs jarring when multiple columns collapse.
As a person that currently maintains separate versions for desktop and mobile - it is not shameful. It is just good sense.
You are still constrained with a lot of low power devices on the mobile side and old versions of IE on the desktop side. So it is big PITA to reconcile all of this.
In 5 year they will converge but right now it is too early.
The needs of both are the same: simple, readable design. Every time I see a site with these two versions I've found that I preferred one to the other, on both devices - either the desktop version's better even on mobile, or (usually) the mobile version's better even on desktop.
Mobile phones (via apps) are a lot more monetisable. Part of the decision may have been motivated by this (i.e. push mobile users towards the apps by limiting the responsiveness of the main website).
I'm not saying I agree with this (and I don't have any real evidence that this guided the decision) but it is a possibility.
I do a lot of django and drupal development so I use screen, vim, terminal, hg/git/svn, virtualenv and MAMP. I also use firefox with firebug, and the Live HTTP headers plugin, and virtualbox for virtual windows and linux environments.
