I just watched an hour long program last week about the honey bee die-off. Based on that program, I would conclude that the problem is very real. Hive colonies rely on scouts returning to the hive to relay detailed instructions to the collective regarding the location of pollinating plants using an intricate "dance". Scientists have observed these workers either deploying and never returning to the hive, or even more strangely, returning, but failing to accurately relay their information.
But the preliminary conclusion of the scientists on this program had nothing to do with cell-phones, global warming, or anything else. They traced anomalies to an immunodeficiency AIDS-like virus that they believe came from the importation of Australian honey bees.