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You can run them in JBOD and have them show up as one giant drive, or RAID 5 if you have a bunch of similar capacity.
Use a Highpoint 454 if you don't have enough PATA channels - it will support eight drives.
http://www.newegg.com/Product/Product.aspx?Item=N82E16816115016 (or http://www.newegg.ca/Product/Product.aspx?Item=N82E16816115016)
I have a 6GB Hitachi MicroDrive (1" CompactFlash, 3600rpm, 128kb cache) that I keep around.
The problem with running that many old drives is the cost of a controller like that in addition to the electricity they will draw is going to be more than a larger capacity drive. That isn't even mentioning the fact that they are much farther in their life, more likely to die, and it will likely be a pain to setup. I wouldn't suggest it. However, if that seems fun to you, by all means, try it. Old hardware can be fun to play with. I wouldn't store anything you care about on it, though.
I have quite a few old hard drives over the years and have done so many things with them.
When I built my first RAID it was from a few old similar drives that I had no more use for. I've bought docks and external enclosures to make them portable backups, I have put together media PCs that housed all of my music and home file servers that all my networked PCs do backups to. I've installed them as secondary drives to install and play around with Operating Systems I'm not familiar with.
Otherwise they're fun to take out back and put a few holes in before you end up tossing them out or recycling them.
And just for the sake of coolness
http://mashable.com/2011/09/13/hard-drive-creations/