Diane Sawyer’s tenure as anchor of ABC’s World News begins tonight at 6:30 ET. The former Good Morning America co-host has an exclusive interview with Iranian president Mahmoud Ahmadinejad about three American hikers who accidentally crossed into Iranian territory and whether Iran has been testing a neutron initiator. You can watch part of the interview, as well as a snippet of Sawyer’s appearance on today’s GMA in which she and Robin are so excited to see each other that they clasp hands for a bit,at Diane’s also hosting a web-only series called The Conversation. In today’s, she and John Karl talk health care and Diane is wearing a hoodie!

Planning on tuning in? And if you already have, what did you think of Diane’s first show?