Pastors find inspiration for their sermon topics in a variety of ways. In this current culture of church media, a new video can be the launching point to a new teaching series. If you are in a brainstorming mode for an upcoming series I would suggest taking 30 minutes to an hour and view some of the new videos available at WorshipHouseMedia.com or SermonSpice.com.
I would also suggest checking out the sermon starters at Crossroads-Creative. They have produced over 65 short intros that are ready-made for your new teaching series.