It's not updated with last night, but playing around with this you can see that just using his national averages, Trump basically has a really strong inside track on the nomination as long as he merely wins enough WTA's and doesn't get beat too hard in other states: http://www.realclearpolitics.com/epolls/writeup/the_gop_race_for_delegates_an_interactive_tool.html
Nice site, doesn't seem to understand winner takes all tho?
Oh wait it does, just not all delegates.