Niccolo Machiavelli published this still appropriate observation in The Prince (1513).
There is nothing more difficult to plan, more doubtful of success nor more dangerous to manage than the creation of a new system. For the initiator has the enmity of all who profit by the preservation of the old institutions and merely lukewarm defenders in those who would gain by the new ones. The hesitation of the latter arises in part from the fear of their adversaries, who have the law on their side and in part from the general skeptisicism of mankind which does not really believe in an innovation until experience proves its value. So it happens that whenever his enemies have occasion to attack the innovator they do so with the passion of partisans while the others defend him sluggishly, so that the innovator and his party are alike vulnerable.
This quote came to mind after thinking about how some teachers as Tableteers and UMPCs (Umphies?) face challenges as they bring new technologies into schools.
Kudos to teachers who find work through these challenges. You help to demonstrate the value of mobile PCs in education. Your demonstrations persuade others to follow your lead. Keep up the good work.