There's several ticker sites but the one I know off the top of my head is distickers.com.
Early Bird Check In, the Southwest service. $10 per person to enable automatic check-in within 36 hours of your flight.
We expect the LM fridges to be smaller and to omit the freezer compartment. Look in post #1 of the Pop Century thread to see an example:
http://www.disboards.com/showthread.php?t=2914418
Mickey Mail is the term to describe one or two mailings 3-4 weeks in advance of your arrival, including your Disney Magical Express vouchers and luggage tags and your resort/package reservation information with souvenir bag tags.