Greenpapers is usually as accurate as an estimate will be. In the end we plan to pick up a bunch of Santorum's Iowa delegates, but of course, Romney will be trying as well. Note this however:
Total Number of delegates: 2286
Unallocated delegates: 2229
Number of delegates needed to win: 1144
Note that 57 have been awarded, in total. After Florida, that will be 107. There are 2286 and we need 1144
Let's keep this in perspective.
But CNN has Huntsman winning zero, and that isn't so, he got one in NH, I'm pretty sure. Greenpapers is usually the best estimate, granted in some states getting delegates is a process and you don't know until the end.