I was stoked about carman when 0.7 came out, but I was a bit disappointed. I'm not a car geek, so I see it from the common user view. I'd love to see Carman use maemo mapper as a backend, or at least the same maps on my SD. I'd also love to see some type of Trip Analyzer®

-Shortest time to X
-Shortest distance to X
-Least fuel consumption to X
-Fewest stops, etc.

Add in some reminders (oil change, tires) and a Canola plugin. I also thought that the carman team should team up with Nokia and combine Carman + Nokia Maps to create some uber navigation software.