iPhone/iPod Touch works out of the box on Ubuntu 10.04 (confirmed).
Yesterday came the first announce which said that Ubuntu 10.04 supports iPhone/iPod Touch out of the box. Now, more and more people (including me) are confirming that this is true (including unjailbroken devices). The method works even if Ubuntu is ran via VirtualBox (tested by me).
For additional details about running Ubuntu 10.04 in VirtualBox, follow this link.