USB IDE Enclosures
http://www.tigerdirect.com/applications/category/category_slc.asp?CatId=1204&name=Enclosures
[i]Most USB Drives need to be set to Master not Cable Select when used like this.[/i]
SATA Enclosure
http://www.cooldrives.com/sahadrenfors.html
Only thing to remember is that these enclosures allow a drive to overheat so if you need to use it for long periods of time you should use an Actively Cooled Enclosure like the MX1 from Antec
http://www.antec.com/Believe_it/product.php?id=NDc=
You also need to Dismount the Drives before turning off the computer that they are connected to or unplugging them so use the Dismount Option under Linux or the Safely Remove Option under Windows.
If you do not dismount the drives before unplugging them or turning off the computer the Partition Tables on the drive will get corrupted and then you'll have to pay to recover the Data. Also don't move the drive after unplugging it till the Platters have had time to stop spinning and most importantly [b]Do Not[/b] move the drive while it is running.
The 2 biggest killers of Mechanical HDD's is Vibrational Damage or Overheating. So if you keep that in mind the drive will last a very long time in the enclosure. If you ignore that the drive will report as Blank/RAW and your Data will be gone and the drive can not live as long as it otherwise should. ;)
Col