Double Shot #1084

Ruby 2.0.0 in Detail - If you haven't been paying attention, this will get you up to speed.
Announcing Kiln Harmony: the Future of DVCS - I can't say I personally have ever seen a project where developers argued over Mercurial vs Git, but if you have, this is potentially interesting.
Saiku - Open source OLAP analysis suite.
Learn CSS Layout - Online tutorial.