Memcache is a great way to store session data in Rails. It is easy to install on Linux (sudo apt-get install memcached), but how about on Mac OS Snow Leopard? Follow these directions and you should be up and going:
$ curl -O http://www.monkey.org/~provos/libevent-1.4.12-stable.tar.gz $ tar xzvf libevent-1.4.12-stable.tar.gz $ cd libevent-1.4.12-stable $ ./configure $ make $ make verify $ sudo make install
$ curl -O http://memcached.googlecode.com/files/memcached-1.4.1.tar.gz $ tar xzvf memcached-1.4.1.tar.gz $ cd memcached-1.4.1 $ ./configure $ make $ make test $ sudo make install
$ memcached -d -P pidfile -l 127.0.0.1

Alternative:
* Install Homebrew ( http://github.com/mxcl/homebrew )
* brew install memcached
* enjoy!
I was wondering if you had an opinion on installing the MacPorts version. I like that route to manage packages, but it’s not always the best way.
sudo port install memcached @1.2.6 (or whatever version you need/desire)