Code for a platform and build it for multiple platforms

We create our Eclipse RCP application in Windows. We can then build it to be installed on multiple platforms including Linux, Mac OS.
Isnt this great...

Code it in the platform you are comfortable it. Trust Eclipse to build your executable for multiple other platforms...

Steps involved in making use of this feature:

We need Eclipse Delta pack to be installed on top of Regular Eclipse RCP
Below links are for the latest release of Eclipse 3.5 Galileo:

http://www.eclipse.org/downloads/download.php?file=/technology/epp/downloads/release/galileo/R/eclipse-rcp-galileo-win32.zip

http://www.eclipse.org/downloads/download.php?file=/eclipse/downloads/drops/R-3.5-200906111540/eclipse-3.5-delta-pack.zip

We can use use wizard approach to build for multiple platforms. Another way the same can be achieved is through PDE Headless build. The Headless build will be most required when the task needs to be automated to run regularly as it happens for any software project.

A good reference for both of the above approaches...
http://www.vogella.de/articles/EclipsePDEBuild/article.html

Few points to be remembered:
Eclipse delta pack is imperative for headless build and building for multiple platforms

For including files in the root/sub folder of the executable, it will be easier accomplished if we create a feature for the product.
Follow the steps in
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse.pde.doc.user/tasks/pde_rootfiles.htm