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Apple will reportedly start stuffing ads into the Maps app
(www.engadget.com)
This is a most excellent place for technology news and articles.
Yep it uses a selection of the most important data from OSM because the entire thing would be too huge to keep on your phone. You download the map in sections so region/city based but you can also just get an entire country which will be a few GB.
It can import/export bookmarks and record and import gpx tracks. Has TTS support and you can even edit things (like opening hours and stuff) if you have an OSM account.