If you are presenting to a live audience over the web, here are some great presentation tips from SlideRocket that will keep your audience engaged and excited:
Keep It Interactive - It’s harder to keep your audience engaged when everyone is scattered across multiple remote locations, so speaking non-stop for a half hour, then saving Q&A until the end may not be the best approach. Take polls or surveys, ask questions, or solicit input at various points throughout the presentation. This type of ongoing interaction will keep attendees interested until the end of your session.
Keep It Short - Webcast participants are either at home or in their offices, leaving room for many distractions like ringing phones, knocks at the door, or the temptation to perform other work while they’re listening to you speak. Therefore, your discussion should be shorter than usual. link.