Just recently Garmin introduced the Garmin POI Loader. This allows users to create custom POI files for the Garmin, or use POI files in the csv format generated by third parties.
Of course PocketGPSWorld.com has a huge resource of POIs and we are working hard to convert them all into the correct format for the Garmin POI Loader.
This will make them compatible with a range of the new Garmin navigation devices including the iQue M3, Quest 2, nuvi, StreetPilot 2720, StreetPilot C310, StreetPilot C320, StreetPilot C330, StreetPilot C340, StreetPilot i2, StreetPilot i3, and StreetPilot i5.
Click here for the main PocketGPSWorld.com POI database page.
If you have one of these compatible systems then you will need to download the Garmin POI Loader from the Garmin site here.