RPM of new version 1.0.6 of the library to communicate with servers is available in remi repository for Fedora et Enterprise Linux. It's also available in rawhide.
As always:
yum --enablerepo=remi install libmemcached
As this new version breaks ABI (with previous 1.0.4), I don't plan any update in the fedora ≤ 17 repository.
So :
fedora 15 : version 0.47, libmemcached.so.6
fedora 16 : version 0.49, libmemcached.so.7
fedora 17 : version 1.0.4, libmemcached.so.9
rawhide : version 1.0.6,...