Well, ot in my experience. Native apps still have an edge. For example: twitter web interface is nice, but twitter the iOS app is WAY better on iPad. Also, I don't see something of the quality of Flipboard coming as web app (and clipboard get content from web, after all). May be this will change, but we are still not here.
I don't get the appeal of Flipboard at all. It's pretty, but the reason that good books are pleasant to read is that someone has carefully laid out all the content on each page. Splashing a bunch of random news items with truncated headings on a virtualized book doesn't get you there.
I suspect we'll look back on this early period of tablet software design with a laugh. All these clones of real-world objects (iBooks) will seem quaint and naive and conservative.
