Over at jclark.org they have made a nice tour of how to rescue data of a Windows PC using Ubuntu. Plenty of screenshots.
You can see for yourself here
My preaching the joys of Mac to all my coworkers has claimed another victim; John, who I share my office with, purchase a shiny new 20″ iMac G5 two days ago. John asked me for a way to get some files off his old Windows PC without booting Windows, because his Windows install is very flaky, and doesn't like to boot anymore. I developed the following procedure using a Ubuntu Live CD.