Why nobody is doing a similar tool for the web? (except Microsoft). I believe many are using OSX or Linux and didn't experienced OneNote themselves.
I feel OneNote would be better if it acquired that awesome Operational Transformation features that Etherpad demonstrated so well, and shed all that fancy formatting features that requires so much complexity.
Normal people don't require yet another Word clone - a simple editor that supports basic Markdown-like features (bullet points, numbering, headlines) is perfectly sufficient to get the contents of a document rolling (and if needed, Word can be used for adding formatting later), but what _is_ essential is a dead simple way to collaborate.
I've been following the OneNote team blog for quite a while now, and it seems like they're adding more collaboration features in the next version of Office, but don't hold your breath - it looks like yet another incredibly complicated mechanism that requires more trouble than it is worth.
_Sigh_
In the past I felt that Google Sites (ex JotSpot) would follow that route but it seems it's now in the limbo.
(EDIT: cancel that, I'm an idiot. I just found a big honking "Find Tags" button right on the main ribbon that I'd completely overlooked before.)
I never understood the appeal of storing the entire freaking notebook in a single file either. When I started using onenote, I used the webcam recording feature as a sort of video diary, and this completely broke down my backup scripts (I put everything on amazon s3, which doesn't support diffs.)
/ end rant
Back to your comment, I don't quite understand what you mean by the online spreadsheet integration. Could you elaborate? I mean, the contacts integration with Outlook is pretty cool, but is virtually useless with anything else in the universe. What is the advantage here?
What I tried to say with integration is that you can read from external sources and put the information in OneNote automatically, you need to build some add-on or connect from a scripting language to do that.
Look at the bottom of the Tags Summary panel when you click on the "Find Tags" button. You should see a "Create Summary Page" option. It's a great way to create summary/wrapup's of meetings and projects.
Finally I desisted because [technical rant] While I can use the UITextView (an UIWebView) there was a big possibility to be refused on the App Store after using some hidden methods. The other alternative was building a complete rich editor myself but was outside the project budget.
So, I believe that EverNote must follow a similar route to include links and others features.