Offline Gmail, Google Docs, Helvetireader, etc. using Fluid

UPDATE: Helvetwitter is out! See www.josefrichter.com/helvetwitter
In a previous post, I was explaining how to enable Google Gears within Mozilla Prism to turn Gmail, Google Docs and other Google Applications into stand-alone offline applications, that may come useful e.g. when you are in plane or train.
You may know, that specifically for Mac, there is an alternative [...]