left shirt pocket. Just like every other phone in the past.
ack!
Bent over to check something in our pond and that is exactly where my phone was. Emphasis on was. This was back a couple years ago with a flip phone. It stayed lit up with it's nice blue color until I fished it out and yanked the battery. That was the last time that phone ever ran.
My moto-droid is in my front left jeans (and other pants) pocket with nothing else. No issues with it getting hurt. Had it since 11/2009.
To me a case would just add to the size. I'm happy enough with it just as it is. No screen protector or anything. I don't think the droid x would cause a problem size wise either.