I was lucky enough to be able to attend Maemo Summit this year. The event was really nice and had many interesting talks, you can find a lot on the maemo wiki, pictures on flickr, etc. Just google and you will find. The biggest surprise was that everyone attending got a N900 for 6 months to play with.

Relating to OSM, Till presented OSM2go and the OSM project in general, with some nice example of why OSM rocks :) Look here: http://thenokiablog.com/2009/10/11/maemo-summit-liveblog-day-3/ (at about 10:45)

As a good OSMer I did some mapping at the summit venue (mentioned there too). Some of the information is waiting in my camera and N810 to get processed.