I've been trying to "go all iPad" but not succeeding. The lack of flash on the browser, and (I am so ashamed to admit) lack of parallels desktop (handy for connecting to my work). I also find iPad quite buggy compared to the mac with the browser freezing up at times which I've just never seen. Oh and I use Firefox with Xmarks which is nice so I don't have my bookmarks.
I will live with iPad for now, still great for my short travels, but on longer trips I am dragging along my MB Pro, which is heavy. Maybe my next chapter will be MBA