Share 'The potential of serious games on mobile devices - is there anything real yet?'

We have an existing client that is interested in deploying serious games on mobile devices (PDA's specifically). We're seeking to go back to them with appropriate and realisable suggestions but we're not finidng anything liek that out there already. Most examples we have found fall into 'blue skies research (no immeadiate applications in business)', 'tourism', 'quiz/edutainment' or 'arcade/casual…