Could be great to triple boot, if given a big enough hard drive, and some extra know how to make three equal partitions. Windows Vista on the primary, Windows XP on the second partition, and Red Hat on the third. Why Red Hat? Well, even tho it's open source, it, however, seems to be the most supported distro by the commercial community as well, most companies, hardware vendors, and some software companies seem to support Red Hat and/or Novell over anyone else. I mean, Ubuntu is great, don't get me wrong, but most commercial-based software companies just don't fit into Ubuntu's model, unlike Red Hat, Xandros, Linspire, or Novell at this point.