For the car charger Verizon just sells a universal charger. So I kept my Motorola Q9C charger. Works fine.
Will I damage my Imagio if I use my Motorola AC charger? My Imagio shows the charge icon when I plugged it in, but I only did it for a moment since I don't know.
I could plug in my HTC charger but my family has several Motorolas so it would be more convenient to have one charger.
No. I am using a charger from a Motorola Razr. I also bought a $1 car charger with multiple, changeable tips on it from the Dollar Store. 3 weeks, no problems.
As long as the charger says 5VDC @ 1A and not defective it will work fine. I use my Garmin Nuvi charger in the car and a cheap Ipod touch charger with no issues.