> I have a Qube2 and was wondering about hard disks. The thing currently 
> in there is unbranded and largely unlabelled, so what should I look for 
> when getting a new disk?
> 
> I figure that lower-RPM drives like 5400 as opposed to the 7200 and 
> 10000 will be quieter and consume less power.
> 
> Any other suggestions?

As much as I remember, any standard IDE-drive will do. See also
http://www.shon.org/qube/ as this guy installed two disks into his Qube II.

Currently Samsung drives are assessed to be both quiet and cool.

Regards
Carsten