Get an external USB or Firewire case. Since it's a 7200 RPM, I would go with FW400. FW800 even better.
OWC makes a very nice FW800/USB2 case. It comes with a carry case and all cables (I have a 7200 200GB drive in it). I also have one from Newegg by Rosewill. No problems with it so far (I have a 320 7200 in it right now). I prefer the OWC, but it is a bit more pricey. Both self-power off Firewire.
For USB2 only, I have a few made by Sabrent. They self-power off a single USB port (though they do come with one of those "Y" adapters).