NHC has been doing an overall great job keeping up with these storms and incorporating an incredible amount of analysis and forecast data into their advisories.
Bottom line is that Hanna should be a hurricane in 24 hours and will likely inundate the northern Bahamas with squalls by Thursday before paralleling the FL east coast with high surf and landfalling along SC coast Friday.
By the time Ike enters this region on Sunday, he'll be encountering increased shear, just like Hanna has been, and seems to be destined for a WSW path across eastern Cuba, although the models are all suggesting slightly different variations at this point in time, as noted by NHC.
I think it's been very interesting to see Hanna holding off and holding its own, until Gustav dissipates and merges with an approaching trof.