What changes can/should be made to a working v0.2.2 torrc for best 0.2.3 operation?
What are the major changes (SMP? IPv6? memory/CPU requirements?) that should be considered when establishing a new relay?
I'm interested in this, too. 2.3 is supposed to use less CPU if you have new versions of OpenSSL. There's no practical IPv6 support. NumCPUs now defaults to use all your CPUs, so set it if that's not desirable, or remove it if it is and you had it explicitely in your torrc.