Apparently, Mark Hamill is supposed to be on Radio 1 in the UK tommorow between 1 and 4pm, on Edith Bowman's show. It should be a fairly positive affair, considering she's the resident geek.
You can listen (live or afterwards) over the web here:
http://www.bbc.co.uk/radio1/listen/ I caught the end of her show today - asking for questions to be emailed in for tomorrow. I imagine there will be squillions emailed in, but if you can think of something juicy....
http://www.bbc.co.uk/radio1/edithbowman/email.shtml