I have a Titan without cell service (Wi-Fi instead) used as a permanent color Weather Station display via WeatherPanel and a full screen skin showing current/5 day forcast/radar and such...
Also have Skype running 24/7 in background, so it is still a phone...
Have also installed Pandora, but not liking the quality of sound...
You might wat to check out Today Screen type apps that display and update live data without you touching on subjects you like such as NFL scores, Stocks, RSS News Tickers, Traffic Cams, etc...
If you don't use Wi-Fi, you can always load up Garmin XT (not free) and keep in car permanently... Also can use to take GPS-Tagged Photos via camera....
You might use the Touch Pro Pre Alpha Android build to test out stuff you wouldn't want to to on you primary cell...