I was just setting up my old openmoko GTA02 so my kid could have a phone with a prepaid SIM and was reminded about tangoGPS. It was the only GPS I had on that gadget.

The big reason why I would like to have tangoGPS on my N900 is the share location with friends or use it so we can find each other downtown. It is great for finding friends meeting up like you were on that show 24. I don't think there is an app for the N900 which lets you track friends.