Lost Qs

So after finding out that the entire catalog of the television show Lost is available on the ABC website I decided to start watching.
I've tried to get into the show a couple of times before, but what I'd come to find is that its a show you need to get in on at the ground floor if you don't want to be... Lost.

If you don't know the show brings up lots of questions, so after a bit of discussion with a friend who also watches the show I thought I'd compile a list here of questions I'd like answered before the show concludes.

?:
Where did Hurley get his nickname?