(Links still don't seem to work, reposted message with links.)
A while ago some very cheap (ingredients and manufacturing cost in large quantities), environmentally-friendly, plentiful, non-toxic, ingredients are abundant and practical material was discovered for hydrogen storage:
http://www.gizmag.com/the-horizon-fuel-cell-technologies-hydrofill-personal-desktop-hydrogen/13691/
http://www.gizmag.com/horizon-fuel-cell-unmanned-aircraft/11913/
These two articles show two buy-able products using sodium silicate and mention advantages.
We have this great technology, why isn't this already used more in electric cars and power buffers for the electric grid?
http://www.fuelcellseminar.com/media/9030/com34-5%20wallace.pdf
Also if somebody wants to buy something, avoid the awful PowerTrekk cartridges (made by myFC)
try to get something that works like the Hydrostik cartridges from Horizon Fuel Cell Technologies .
The PowerTrekk cartridges aren't very well thought out. Have a pretty severe design flaw.