emagin, I would likely do what you have suggested, combine the data in an Excel file.
I just read S&T Blog, a review of a source of POIs for RV travelers:
REVIEW: RV Directions 2009 POI CD
By the way, regular visitors to S&T Blog may notice the old profile picture which included a box shot of MS Streets & Trips has recently been replaced by the faces of two guys who are obviously having too much fun . The new picture is of Gladwin (right) and Larry (left), both active members here at Laptop GPS World. It was the only picture they had of the both of them, and Larry liked it because they were having fun at the Microsoft museum/visitor's center and they took the picture there.