Leopard: What happened to /etc/rc and `id`?

While doing some testing on a new install of Leopard Server, I noticed a couple big under the hood changes: 1) no /etc/rc: Where does the OS set the location of VM swap file now? 2) If you try to run the id(1) command in single user mode, well... you can't. There go a whole slew of shell scripts I used to use. My primary concerns are startup config (where the heck to I set the swap file location now?), and what I can use to replace my trusty old calls to id with. Any insight? As usual, I'm not finding much (read ANY) docs on this on Apple knowledge base.