Synopsis:    This week Mark and Shawn are joined by Nat Robinson, V.P. Marketing and Business Development for Sliderocket to talk about one of their favorite web-based presentation tools. Links: Sliderocket TIPS: Tech Tip of the Week: HandyFile Find and Replace - find and replace text within entire directory structures Teacher Tip of the Week: Vocaroo - Record messages of any length through your browser and share them with others.