If you got a new computer, you have a couple of options for your old HD (that I can think of, anyway)
Get an enclosure, and hook it up to your new computer via USB/ Firewire/ whateva... Another option would be to set the old hard drive to run as a slave, crack the case of your new computer, and install it internally.
Either way, it shouldn't be a problem at all to pull the data off of the old drive.
j