I'm not sure I would go as far as to say "popular", but I have an application for gardeners that has been available for about a year now. It has a number of active users, mostly in the UK and Canada.
It is quite ordinary to look at - only standard controls, though it's a substantial program at about 3,000 lines of B4ppc code. It has a supplied database of over 10,000 records and 5,000 pictures and provides similar functions to a mature VB6 desktop app. More info at
Plant Base Mobile or
this mobile friendly page.