Glenn's Gases 1.5.0 is now out! This update is for Minecraft 1.7.2 only and features two new gases and a huge amount of small changes. Have look for yourself!

• Added several new fields in the Configurations and renamed some.
• Replaced the Glowstone Shard reaction with the Dust Cycle. Also removed the Glowstone Shard from the creative tab.
• Added Snapdragon and Primitive Respirator.
• Added Rusted Iron Ore and Rusted Iron Block.
• Added Black Damp and Chlorine Gas.
• Void Gas is now pipeable and can be extracted from Bedrock. Bedrock also emits Void Gas differently, and the Void Gas is less tolerant to light.
• Added a slowness effect to some gases, and altered the properties of some gases.
• Increased the light range of Lantern With Torch.
• Fixed major client/server sync issues with Glowstone Shards.
• Added a custom death message for asphyxiation.
• Added proper step sounds to various blocks.
• Gas Pipes, Gas Pumps and Gas Collectors that are attemping to fill empty space with gas have a possibility of doing so even if a gas is in the way.
• The grill of the Gas Furnace now indicates its temperature, and the temperature will also be properly indicated in the GUI. Also fixed its inventory graphic.
• Gas Lanterns can now connect to pipes and feed off gas from them.
• Gases inside Gas Pipes will now ignite when the pipe is exploded.
• Changed rendering of various blocks to look better when being broken.
• Blindness now goes away more quickly.
• Gas now generates in less frequent, but bigger Gas Pockets which may or may not consist of several small subpockets. Should increase performace by a bit.
• Gas Clouds may or may not consist of several subclouds. Should increase performace by a bit.
• Electric Gas will now only emit sparks when a living entity is nearby. The sparks will no longer hurt living entities through obstacles.
• Gas Pipes can now generate in small clusters underground.

For those of you who are still stuck on 1.6.4 and 1.6.2, there is a hotfix available for two small issues.

• Fixed the world generation Configurations and made it possible to have a chance to generate instead of an amount to generate.
• Fixed corrosive gas causing crashes when trying to corrode certain blocks.

Also, I have compiled a lot of information about Glenn's Gases on the newly released Information Database. Have a look there if there is something you want to know!