Most organizations already have a schedule of regularized training – both for core, mission-critial, applications as they undergo revision and update – and in accommodating new apps and business methods.
It’s the nature of the beast: These devices lend themselves to a certain “rounding” – abbreviations and the compacting of words that would never be tolerated through other means: the support of texting; IM’ing; “friending;” Twittering, etc.
Too, there is the ready “firing off” of communications without the appropriate distance (time) for review. Ensure that business communications remain… business-like. You should train for caution, and for adherence to that standard.
Also remember to train staff in troubleshooting measures. When important business is being conducted through mobile, device-unavailability can put a real crimp in operations. Oftentimes routine problems can be overcome with simple guidance. Users should be able to examine connectivity issues to include setups, the verification of account info such as user ID and password, and they should have ready-access to a support desk.