Jenny, my wife, finally ran out of space on her 40Gb laptop hard disk so I upgraded it. I liked the reviews of the Seagate drives and eventually settled on a Seagate Momentus 7200.1 100Gb UATA drive. It's real sweet. Very quiet and zips along at 7200rpm. Highly recommended.
I also picked up a Sumvision USB 2.0 2.5" Aluminium Silver Caddy to turn her old disk into an external drive. For only £6, it's excellent. It'll take Jenny a while to fill them both up. Both items purchased on Ebuyer.
While installing Windows XP on the new drive, I discovered a new trick. Her Acer Travelmate 800 uses an ATI Mobility Radeon 9000 chipset which is only supported by the old Catalyst 4.12 drivers. However, if you get ahold of DHmodtool4.exe, you can modify the latest ATI Catalyst drivers to run on the 9000. It worked a treat.
My only problem is I can't get the PCI Modem driver to work.