> - sda1: 20GB, NTFS
You can fix that with "mkfs -t ext3" :-)
> In particular,
>
> - will adding the new partition result in the partition labels changing
> (i.e., can I add sda4 between sda1 and sda2) and are there any
> possible problems with this (e.g., reconfiguring GRUB)?
That depends on which version of fdisk you use :-)
Most of the time, you'll be just fine - but try it, and *check* the layout
before you commit. If in doubt - abort & try again.
> - anyone had any trouble growing an ext3 system while it was on-line
> on a modern kernel?
Nope. Works just fine.
Vic.