The speed issue is why Google starting work on there Gears project, so that you don't need a persistent net connection, you can use the apps on & off-line. Security wise, connecting to Googles secure login is probably one of the most secure things you can do on the net, there are far easier ways to gather peoples personal info *cough* "MONSTER" *cough*

And as for Licence fees, google corporate versions of this kit are $50 per seat per year, or there are site wide options, there are already a few goverments and power corps using docs and with the inclusion of the new toys coming in the next year that shall probably only grow.