Animated Promotional Video w/ hand drawings

I have a script, that should take 3-5 minutes to read. I'd like to add some visual elements to make a more compelling video. Here are a couple examples of what I'm looking for: [login to view URL];feature=related [login to view URL];feature=related I can likely handle the voiceover component, although would welcome bidders to factor this both ways when bidding. I'd really appreciate seeing previous work samples so I can be clear on what your capabilities are. If this goes well, we will likely have a handful of other similar projects right behind this one. I'm also open to hearing about other ways (seeing examples) to communicate topics of conversation like this in a compelling and enjoyable way. I'm not opposed to hiring hourly...just not too certain how long/what to expect from this sort of project.