*** .externalToolBuilders/
This directory stores project-specific launch configurations for external tool builders, such as ant tasks that have to be executed to fulfill the build lifecycle

*** *.launch
It is possible to store "eclipse launch configurations" in external files. These (XML-)files may be stored anywhere within your projects and will be discovered by Eclipse automagically.

The behavior is documented in [1].
The prefix doesn't seem to be documented, but it is hardoced as described in [2].

[1]: http://www.gnu.org/software/emacs/manual/html_node/emacs/Interlocking.html#Interlocking
[2]: http://tekman.livejournal.com/79598.html

added archive extentions (lzma xz)

In Global/OSX.gitignore .DS_Store? didn't match .DS_Store (a question mark (?) matches a single character).

Added since RIA/Silverlight projects use this for generated code that doesn't get added into source control.

Added since RIA/Silverlight projects use this for generated code that doesn't get added into source control.

Grouped all VC++ files together. Added new file extensions and folders used by Visual C++ 2010.