> What is the maximum drive capacity the Qube 2 will
> support?

probably 137G due to chipset/ATA limitations, but thats a guess

> What's the biggest drive anyone has successfully used?

I'm currently using a 120G Maxtor 4G120J6 with no problems.

> Has anyone out there turned a Qube 2 into a usable mass storage
> system? This is for my home network, so the Qube is ideal because
> it's quite and it looks cool. So it comes down it practicality.

Yeah, my qube2 is my nfs and internal mail server.  It works well
enough, though its not particularly fast.  I play flac files over NFS
more or less all day from my linux workstation (nfs v3), which keeps
the load avg of my cobalt at about 1.3+.  Additional network durress
usually means dropouts.  If you've already got the machine though I
see no reason not to use it as network storage.  It might not be able
to host as much ata disk as a modern pc, but its still useful.  And if
you feel really ambitious you can try finding a PCI disk controller to
overcome the bus limitations.  Though I'll warn you right now, I
haven't had much luck with the siop driver.  (though I haven't tried
again since 1.6 came out)

-- 
Jamie Heilman                   http://audible.transient.net/~jamie/
"We must be born with an intuition of mortality.  Before we know the words
 for it, before we know there are words, out we come bloodied and squalling
 with the knowledge that for all the compasses in the world, there's only
 one direction, and time is its only measure."		-Rosencrantz