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Well for the most part; Linux and BSD, and really, ANY Unix based OS, are gonna have pretty good system support when it comes to running on older hardware.

I mean, any of those things you choose...

I just found out about this one:

http://distrowatch.com/table.php?distribution=backbox

I haven't tried it out yet, or even downloaded it yet, but it looks good on paper I guess is the way I'd...

Coffee Cup, you've never done Mpentoo?

Two of the three I listed are on your list, and I also have SLAX, but I forgot about it. I generally keep "Interesting" Distros of stuff.

I still have two...

There's a lot of distros aimed at this, and off the top of my head, some I've downloaded are:

Mpentoo
Backtrack
Knoppix STD

You can probably find more though. I can't really say all of those...