Skinomi has their techskin available for the D4. I was much happier than the ZAGG, one the warranty is great, they replace for a nominal fee regardless of reason, two) cheaper for the same quality, three) I like the feel of the tech skin better.
I also bought the lapdock100 and love it. Nice quality and really gives me laptop light functionality. It can't/won't replace a laptop or desktop but makes things easier when trying to pump out some work emails or just general browsing.