Based on what I have read 4GB cards seem to be hit and miss but I am thinking about getting Mobilnova in the future so the 4GB would be nice. So now I am thinking about getting two 2GB cards. One should be plenty for the TT1 with all the extra POI's and other apps on it too. Then I was thinking about using the other card for the Mobilnova but I was wondering what if anything needs to be installed on it. Can I just add the app or does it require the TT software to run? I would imagine I could get rid of the maps so most of the card would be available for videos. The other option I was thinking about was wiping out the internal memory, adding the Mobilnova and using the remaining space for videos......obviously this wouldn't give me as much storage but is there anything I am missing? Other recommendations?