I saw this at iPhone Alley and had to relay the information.  It appears that one user’s iPhone 3G’s battery got so hot, it melted the plastic backing, killed the sync connector and burnt his leg.  You can see the article here.  The picture, below, came from their site, so all credit to them for the pic. (Thanks, guys!!)

I’ve noticed that my iPhone 3G gets very hot, and it seems that when it does heat up, the battery drains very quickly, in under 2 hours, in fact. However, I’ve noticed that if you cool the phone off and keep it cool, the battery drain stops and returns to normal. I’ve got a phone cradle tatooed to my dash, and it sits right in front of the air conditioner vent. 

I kinda did this on purpose, not to cool the phone, but because it was the best place to put it. The decreased battery drain is just a bonus, I guess. However, I wonder if better venting might help increase battery life?  Why not join us in the discussion and give us your 2 cents..?