Precision 470 with CERC SATA RAID0: dual boot?

[glowing pear]

Hi all,

We recently purchased a Precision 470 with WinXP installed to a 2-disk 160GB
RAID0 array.  I'd like to put Ubuntu Linux on there and be able to dual-boot
it.  I've been doing a lot of research and this doesn't sound particularly
easy, unfortunately (dealing with preexisting software RAID seems like a
dark art in Linux).  Right now, I'm booted off the Dapper Drake LiveCD and I
loaded the aacraid module into the kernel. GPartEd doesn't seem to be able
to see what's going on with the disks, but fdisk does (?)

ubuntu at ubuntu:~$ sudo fdisk -l /dev/sda

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1           6       48163+  de  Dell Utility
/dev/sda2   *           7       19419   155934922+   7  HPFS/NTFS

That sure looks good to me!  I already went into the CERC's BIOS config to
make the array bootable, hence the *.  Now, the $64K question is: how do I
go about resizing the NTFS partition to make room for Linux, and installing
Ubuntu so that Grub can boot either Linux or WinXP?

Thanks!
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