The libusb project is moving again. A version libusb-1.0.9-rc1 release candidate has been tagged in official the git repository.
The version I had to maintain with a fix for ticket #56 is now (mostly) useless. The fix has been included in commit 39fe51e716dd56617480cc0d2a4d3171403e1812.
The final 1.0.9 version is planned for 21st of September 2011 (in 3 days).