Hi there.

I set up navit successfully and tested it a while.

As I need spoken directions, I fiddled around with eSpeak and it turned out that the directions weren't spoken when the mediaplayer was playing. This was caused by the /etc/pulse/xpolicy.conf file, to which I added the following stanza:
That makes the eSpeak-voice hearable even when receiving phone calls. Alternatively, you could use "group = media" to be on the same priority as the media player (i.e. be muted when in calls)
This bugreport helped me greatly.

Also, I'm using the Mbrola voice mb-de5. The ARM-binary from http://tcts.fpms.ac.be/synthesis/ works flawlessly, and the needed files for eSpeak are already shipped. I just downloaded the voice file from the aforementioned website and voila - nice voice talking to me.

Hope that anybody finds these information useful.

Apart from that, the navigation is quite good, considering it's all free. The spoken directions are a bit more complicated to understand than those of "real" navigation systems, but I suppose they use pre-recorded real voices, which gives them some advantage. (of course, this could be done with navit as well. Who's recording? ) The missing compass in the N900 makes it difficult for navit to know which direction I'm looking, so it gets a bit confused when standing still (e.g. at traffic lights), but the screen usually correctly shows what to do.

Tomorrow, I'll be using it for real navigation, hope it works out well.