Go to http://www.gps-data-team.com/us/ to download POI files. You need the CSV POI file format or the MS Excel file format (XLS).
All what you need is to save the CSV file and import it into Streets and Trips.
1. Goto Data menu -> Import Data Wizard
2. Select the CSV file and click [Open].
3. All common CSV POI files use comma as a separator character. Choose the sheet, range, folder, table, query, view, or separator character.
4. Select the data and click [Next].
5. Click [Finish]
The MS Data Wizard will match the records of the data to the specified location, otherwise you will need to match unmatched records.
Plain-text files (txt, csv, asc, or tab files)
Microsoft Office Excel (.xls and .xlsx formats)
Microsoft Office Outlook Contacts
Microsoft Office Access (.accdb and .mdb formats)
Microsoft Streets & Trips 2000 pushpin files (*.stp)
Another database by using a Microsoft Data Link supported by Streets & Trips
S&T 2009 allows the data in the new Office 2007 file formats.
I want to add few custom USA points of interest. Is there any way to use them with Microsoft's Streets & Trips 2009?
Make sure that when you import the CSV with the "Import Data Wizard" you select "Comma" as the separator.
Select Longitude for the first column, Latitude for the second column, name for the third, and address for the fourth column.
Streets & Trips and Autoroute are usually smart enough to determine if the file being imported is using a semi-colon, comma or tab as a separator so you don't usually need to worry about that. TomTom OV2 files can be easily converted using OV2 to CSV converters.