The .gitignore rule "Icon?" will also match directories such as
"icons/", at least on a case-insensitive file-system (this happened to
me on OS X 10.7). I only noticed this several days later because a
developer was complaining about missing icons in his repository. I don't
really know what type of files this rule is supposed to match, but I
guess the described behavior is not expected.

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.

Ignore files generated by OS X that might appear on external disks:
  .Spotlight-V100
  .Trashes

Hopefully comments look better now.

Ignore files generated by OS X that might appear on external disks:
  .Spotlight-V100
  .Trashes

Hopefully comments look better now.

This is common amongst ruby projects in eclipse.