Also, can you all help me make a list (or maybe someone else posted one somewhere) of all the mysteries that remained unanswered? I'll start:

What made Walt special?
Why did all of the babies/mothers die?
Where did DHARMA come from?
What was Widmore Labs' connection to DHARMA?
What connection did Ancient Egypt have to the Island?
What was the significance of the statue?
Why did they call it Taweret when it didn't look anything like Taweret?
If the Island has generic healing powers due to its magical "life source well", then why did Ben need spinal surgery.
Why did Mikhail seem to die so many times, but then come back to life?
Why did Radzinsky make the map on the blast door when he already knew where everything was since he designed the Swan?
Why was there a picture of Anubis consulting with the Smoke Monster if he was created during the Roman years which most likely post-dated the Egyptian presence on the island?
Why did the MIB have no name? Is it because his birth mother didn't pick 2 names? Really?