Just look at Kobo on the iPad:
Kobo on iPad from Kobo on Vimeo.
I have the Kobo app on my iPod Touch, but I don't really use it. It's nice for browsing books and it has a very pretty interface. Browsing is nice because there are so many categories: what they call browse is all arranged by subject, where discover has all sorts of interesting categories like what's new, NYT bestseller, in the news, hidden gems, and many more. However, I haven't actually read anything with Kobo.
And here, of course, is the iBooks app (image from Apple):
I mean, am I really supposed to be able to resist this?