Glenn's Gases 1.3.3 is now out! This is just a mini-release which doesn't really contain anything. What's important is that it works with the newest versions of Minecraft Forge! The only real change is that catching gas in bottles now works, and only the red and green gas can currently be caught in them.
It is avaliable for both Minecraft version 1.6.4 and 1.6.2.