Straight down to the facts Xforms vs Infopath. For those too busy, heres the conclusion.
Both InfoPath and XForms are version 1.0 efforts, and both are likely to improve substantially in future revisions. For organizations that have already licensed Office System 2003, InfoPath will provide an excellent means to automate data collection tasks. For use on systems not running Office System 2003, including Mac and Linux desktops, phones, PDAs, and even some PCs, XForms remains a better path.
Oh this isnt really related but a interesting case study anyway.