I was so excited to see that Greg Koukl could be found streaming live on USTREAM!! I am familiar with Ustream now for some time, and think its a great way for people to Greg in action. Every Sunday he has his live radio show broadcasts, and you can get them in many forms, besides live. Here is a link to his USTREAM radio show page, so you can go back and see him discussing many issues.
You can also chat live if he allows that during the session. Its a really neat avenue to learn more about Greg and his views and reasoning. I have watched a couple segments there myself. Free, and fun too.