I don't have just one most memorable memory. Here are a couple:

*Sitting at my friends table with my DH and my really close friends and just laughing and chatting.
*Having photo's taken with my siblings (all in the bridal party) and my DH.
*My now BIL (then sisters boyfriend) who bent over backwards running around for us and doing everything possible to help out. Fabulous guy.
*My dad's speech. He is a great public speaker.
*My SIL. Managed to cause all the problems that actually did happen. ie, causing everyone to start walking down the aisle too quickly; dashing off with her kids (flower girl and page boy) before we could get photo's done; standing in front of the photographer when he was trying to take photo's of the cake (seriously in every single cake photo). But you know what, they are such little things that really don't matter in the scheme of things, and my wedding was seriously brilliant and fun despite anything she done.
*Going back to the hotel suite DH and I had rented for the two nights after the wedding. Believe it or not there was no hanky panky, but we spent hours in the spa together watching movies and eating chocolate.