Sheikh Yusuf Estes is a well known articulate Muslim speaker. He used to be a protestant preacher before becoming a Muslim speaker. This lecture presents a great introduction to Islam as well as an introduction to Ramadan and fasting. The main theme is Taqua (which literary means seeking protection).
I ask Allah to protect the Sheikh and bless his time.
Yusuf Estes has many websites of very interesting content, the main one is http://www.ShareIslam.com