I never got a thumb injury, but I use my BB in bed alot and my wrist got really sore from the way I held it while laying down. A small price to pay. LOL!!
Lolol ok only one time did my trackball give me a pain but that was bc I colored my LED and put a piece of tape that was 2 big, but now all is normal again!
Posted from my CrackBerry at wapforums.crackberry.com
I've never gotten sore thumbs, just sore wrists. Surprisingly (or maybe not so much?), it hasn't stopped me from feeding my addiction all times of the day and night.