Here's one for finance types and small investors! WSJ Live is an excellent app from the folks at the Wall Street Journal, it gives you access to live news about the market, tech and more and also gives you access to the entire video archive of the WSJ on demand videos.
It's like having the WSJ in video form (in fact, most of the content is made with WSJ reporters). If you like to play something on your iPad while you're at work or just want news on in the background, WSJ Live is the perfect app for that. And it's free! [iTunes]