You can talk directly with staff by using the contact form at http://en.support.wordpress.com/contact/ , but as far as I know, there is no direct way to import and it would likely require everything to be copied and pasted manually. But do talk with staff. Perhaps they have some ideas to make things easier on you.
Looked at the app on the AppStore but there’s one hitch though – what I have on iWeb is a Blog2Book project i.e., one blog to a chapter and every post has a photograph! The app doesn’t import photos. But I can always upload the pics.
I opened a ticket with support too. Let’s see what they say!