Kindle Books to iBooks
MacBook Pro, Mac OS X (10.6), iPhone 3Gs 32GB Black
MacBook Pro, Mac OS X (10.6), iPhone 3Gs 32GB Black
I'd bet a lot that the one and only way you'll ever get iBook to read anything, is if you buy it through the iBook store.
But purchasing books? They're all drm'ed and if they're not in the iBooks store, then you're not gonna read them in iBooks.
You can't convert Kindle books. They are proprietary (.azw) format and DRM'ed, as others have stated.
Kindle Books to iBooks