OT re iRock:
I have the iRock 300W and use it with my XP3 and CD deck in my car. Works very well, but you only get about 8 hours of play time from a pair of alkaline AAA batteries. No aux power connection is provided. Nonetheless, a good way to connect to CD units that don't have aux inputs. For about $60, you can get a unit from iRock that is permanently mounted and is powered from your car's battery.
Always tell the truth. Then you'll never have to remember what you said the last time.