Thanks for the link to my blog
One setup to look at is ProWise. You don't need to use their boards, can just have their browser-based software. It does import Smart Notebook files quite well, and can also convert powerpoints etc. It also connects well to iPads using their Proconnect app to allow you to throw a screen to an ipad, have students annotate it,and send it back to the front.
More here : Prowise Presenter v6 is Out. What's New?
You can explore it for free - but you will need to buy a licence to get the most from it.