http://code.google.com/p/memcached/wiki/ReleaseNotes1415 

http://code.google.com/p/memcached/wiki/ReleaseNotes1414 

http://code.google.com/p/memcached/wiki/ReleaseNotes1413 

http://code.google.com/p/memcached/wiki/ReleaseNotes1412 

http://code.google.com/p/memcached/wiki/ReleaseNotes1411 

http://code.google.com/p/memcached/wiki/ReleaseNotes1411-rc1 

http://code.google.com/p/memcached/wiki/ReleaseNotes1411-beta1 

http://code.google.com/p/memcached/wiki/ReleaseNotes1410 

http://code.google.com/p/memcached/wiki/ReleaseNotes149 

Beta with some lock scaling patches