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I have found the many different mobile phones very interesting. Some of the models that were on show from iMate, Palm and Blackberry were interesting. Even Garmin have now produced a phone (designed to be a super GPS of course). Handset manufacturers from the east have also shown great handsets. I found the Viewby from LG to be the most interesting.
If a dominant theme were to be picked, then I think it probably would be Mobile Remittances. The workshops and presentations on this topic was hugely oversubscribed. Maybe this year is the year of mobile transacting.