I picked up a floppy drive several years ago thats very useful for back up.

the LS-120 ( they also made an LS-240 240 meg sized floppy disks)
it uses all formats/sizes of 3.5 floppys and the LS-120 MB floppys made for that drive.

you can still find the drives for about 35 bucks

http://www.pricegrabber.com/search_getprod.php/masterid=67886/search=ls%2520120%2520drive

and the disk for about 7.75 each ( they come in packs of 3 5 and 10 usualy

http://totalmedia.com/catalog/catalog_home.asp?CatID=2018&OID=-1&CID=&bustype=01

realy helpful when you don;t want to burn a CD till you got enough for a full CD

they arn't zip drives either, just like a normal floppy but uses an standerd IDE HD/CD/DVD drive connection instead of a floppy ide connection