FYI: If your volume button gets stuck - This is the fix.
I recently had my volume button get stuck. Odd thing is I do not remember dropping my phone at all. I really think that I must have man handled it and pushed it too hard. I am a pretty big dude so this is entirely possible.
What you will see: The volume will jump around and act erratic. When you look at the phone from the side you will see that the button is actually bent on one end. When you try to reboot the phone it will go into the download mode confirmation screen.
How to fix it: Follow this video up to the 2:45 second mark. http://www.youtube.com/watch?v=9NNvCRW5PiU
When you look at the piece you remove there are some rubber ends on the button. Detach those and remove the button from the little tab in front if it. The button is aluminum and bends REALLY easily. I personally think this is a design flaw and they made it out of material that is too soft. I put it on a hard smooth surface and pressed it down to make it flat. You can also hold it in your fingers and bend it. Either way, make it flat and put it back in.