HOW TO MAKE A CAR PANEL ICON---I don't know how to make it show up in the app drawer but if you want an Icon on your homescreen or one of your other panels download a free app in the market call Any Cut open it and click NEW SHORTCUT-ACTIVITY- scroll down and click Car Panel, it will ask you if you want to rename it or just leave called Car Panel-click okay . You now have a Car Panel icon on your homescreen or what ever panel you put it on. Also when you click Activity it may take a second to populate.
You may notice it says Car Panel twice in the Activity list. They are the same except if you choose the first one when you are in the car panel and click menu-exit it jumps out to your main homescreen, if you chose the second Car Panel the difference is when you exit it goes back out to which ever panel the car panel icon is one.
EDIT- In addition to making a car panel icon you can make icons ofr other hidden ones the the Dock for the desktop cradle and pretty much any other app that is on the phone. I think you can make custom ones too but i haven't messed around with that yet