I can't seem to find the MemcacheD extension for PHP.
There are a few compilations of php_memcache.dll, but that's not the same.
The main thing I'm missing is getMulti(), which doesn't exist in Memcache.
So far I found this, but there's no DLL:
Officially - it does not exist. There are several people who have created their own DLL's though. Here is one person's blog who has created the dll:
http://trondn.blogspot.com/2010/07/libmemcached-on-win32.html
Here is a link to the repository with the source so you can build your own DLL for memcached:
http://bazaar.launchpad.net/~trond-norbye/libmemcached/mingw32/files