There are loads more than those listed below.
The handwriting option is great
I've noticed though that the handwriting option isn't installed on my MSN 7 at work, but it is at home!!!
Wierd
Col
Features:
Winks: Winks allow you to send kisses, hearts and all sorts of silly cartoons to your contacts.
Nudge: Nudge allows you to send a "shake" to your contact. Both your own and your contacts MSN Messenger window will shake, much like how Internet Explorer windows shake using the correct javascript.
Download packs: Download packs will allow users to grab winks/emoticons/display pictures and backgrounds straight from MSN. As these currently don't work we were unable to test them.
Games: Chess Club, Bankshot Billiards Club are included if you're a Instant Games Clubhouse member. Standard Checkers/Solitaire Showdown/Bejeweled/Minesweeper Flags and Tic Tac Toe are still included.
Activities: Activities allow you to share files, calendars, photos and perform tasks such as remote assistance.
Deluxe Display Pictures: Although these are unavailable it seems like MSN are going to supply animated display pictures.