Here is a useful gadget if you want to connect some IDE hard drives to your PC via USB or eSATA, the USB + eSATA to IDE Adapter.
The USB + eSATA to IDE Adapter lets you connects any IDE device to a USB or eSATA port on your PC, and it will supports 3.5 inch hard drives, ATA, ATAPI CD-R/RW and DVD R/RW drives.
Here are the specifications
# PC connection: USB 2.0 / eSATA
# Support 3.5″ IDE Hard Disk / ATA / ATAPI CD-R/RW, DVD-R/RW
# Universal AC adapter
# Supports Windows XP/Vitsa, Mac OS v9.2 or higher
# Dimension: 57 x 40 x 13mm (approx.)
# Weight: 21g
The USB + eSATA to IDE Adapter is available for $33 from Brando.