Starting with my Moment, now to my Evo 4G, and I expect to my future LTEVO, I have and will be using Tasker to implement my car docking features (which simply blows away ALL manufacturer implemented car docking software AFAIK). To put it simply...
When I get in my car, I put my Evo in the universal holster, then I plug in the charging cable. That then prompts my phone to turn on its bluetooth radio, which connects to the bluetooth headset in my car. When that happens, the following occurs:
- Wifi radio turns off.
- GPS radio turns on.
- Screen Timeout turns off
- Launcher Pro launches, throwing up a different background and a custom homescreen filled with shortcuts that are useful when driving (Navigation, Wifi tether, Maps, a very large clock widget, a couple 1-touch calling shortcuts, pandora, etc).
- Screen orientation changes to Landscape (making the clock widget even bigger).
- Screen brightness changes depending on the time of day (very bright during the day, and dim during the night).
- SMS auto-response is activated, informing texters that I am driving and to call me if they need me.
- SMS reader is activated, reading all incoming texts out loud to me.
- Then when I park and disconnect, everything goes back to normal, PLUS the phone automatically saves my car's location for later before it turns the GPS off.
- Later, if I don't remember where I parked, I simply touch the widget on my normal homescreen and it brings up my car's location.
Yes, I have to take the extra step to plug the charger into my phone, rather than it automatically being activated by the dock itself... but whatever that dock launches can't compare to my setup.
Edit: Again, this is all accomplished by using Tasker (which does launch Launcher Pro for the homescreen stuff, but that's all Launcher Pro does).