Well, what do you know. Sometimes spam from Amazon does actually tell me about something I might be interested in.
The item in question here is a little kit that can convert any IDE drive to USB, complete with power supply. Have a look at it here.
The user reviews show that quality is pretty hit or miss, but what you want for 15 bucks? Also indicate it's not really suitable for making a drive a permanent USB attachment, more of a timesaver for somebody who routinely tries to recover or wipe data from multiple IDE hard drives.
It definitely appeals to the technogeek in me. Which is actually most of me.