it is not a good idea to run the raspberry pi off another computers usb port.
If you need a power adapter, consider: http://www.instructables.com/id/Raspberry-Pi-power-cable-adapter/
Another Arm based install: http://www.instructables.com/id/Give-your-Cisco-Linksys-NSLU2-some-muscle-part-1/ Yet another arm install is in the linux hints instructable.
Quickie monitor: http://www.instructables.com/id/McGuyver-monitor/
Note: if you ever want to get back to the first boot menu
$ sudo raspi-config
Step 1: Network setup.
Llater when you want to SSH into the unit it will make it easier. One thing to note is that you must use a username on the Raspberry Pi to log into it.
$ ssh firstname.lastname@example.org
better (use whatever name you set up for the raspberry pi in the router):
$ ssh pi@raspberrypi
Also see: http://www.instructables.com/id/Red-October-network-discovery/
Note: By using ssh means you do not have to leave a keyboard attached to the Raspberry Pi. Saves energy and less cables to deal with.