ok so I just updated iTunes to 9.2.1.5 and as soon as I did it will not recognize any iPhone. my computer will still see them but iTunes will not. I am running several versions of software 3.1.3, 4.0, 4.0.1 and nothing seems to be seen.
ok I worked on this issue for hours with no positive results. I ended up uninstalling iTunes 9.2.1 and then going to oldapps.com and downloaded iTunes 9.2 and it works perfect. funny thing is my backups are still there from the older versions!