If an Exception happens within a using statement does the object still get disposed?

Yes, they will.

using(SPWeb spWeb = spSite.OpenWeb())
{
  // Some Code
}

is equivalent to

{
  SPWeb spWeb = spSite.OpenWeb();
  try
  {

    // Some Code
  }
  finally
  {
    if (spWeb != null)
    {
       spWeb.Dispose();
    }
  }
}

After answering this question, I wrote a more in depth post about the IDisposable and Using construct in my blog.

Yes. A using statement translates to approximately the following construct:

IDisposable x;
try
{
    ...
}
finally
{
    x.Dispose();
}

Yes it does. It's like wrapping your code in a try-finally (and disposing in the finally).

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