Having scripted an object with some physicals,
which takes user controls, I accidentally flew into the ground.
I am now completely stuck, and unable to do anything. I am probably still stuck on the item.
I cannot teleport away, I cannot walk,fly,sit, or access the object on which I am stuck.
I can see myself very far down in the ground when in first person look.
Please help me, I cant play at all now. 
Relog and choose a different place for your starting position. Try http://secondlife.com/community/support.php