I hope to write a complete entry on my reaction to the series finale of LOST soon, but my initial reaction is that I loved it. I have not been able to stop thinking about it all day. I found it very moving.
No matter you're reaction to the last episode you should really take 10 extra minutes and read "Doc" Jensen's LOST review here.
"Doc" has been covering LOST since the beginning for Entertainment Weekly and has been following every trail and thought the show has ever put out there. He's researched all the literary and philosophical references and is about as big of a LOST geek as you can get. I really like his review.
My complete thoughts will follow soon. What did you think?