Can you sync computer with iPhone?
I found an article on Lifehacker about this issue: How to sync an iPhone with two (or more) Computers.


  Plug your iPhone into a variety of
  computers, yours or other people's,
  and you'll find that your phone and
  iTunes want to wipe everything clean
  and start over, every single time.
  Andrew Grant at the Shiny Things blog
  shows how to edit your iTunes Music
  Library XML file to sync your phone
  (or iPod touch) with different
  systems. That means you can, say,
  auto-grab just your music from your
  Mac at home, but grab Contacts and
  Calendars from your work PC. The guide
  requires very little hacking, and
  Grant provides links to simple text
  and hex editors to get the job done.