Update: 14:30 Thanks to Locke333 for spotting that I'd missed the Extended Promo. I've now added it to the player.
I thought it would be useful to make little post that contains all the known promos/trailers and Sneak Peeks.
Also, thanks to PkmnTrainerJ for the following note.
Some trailers have been shortened to include promo for ABC's online player such as "An Action-Filled Return", which no longer features Desmond rushing off, or Richard telling Locke to bring his people back to The Island.
I'm sure there's some other bits, but that one stands out most, as Richard was my favourite part of that one. Maybe the parts removed were considered to be too spoilery?