I personally don't think tracking software matters that much with SnG's except for when you are playing 6 or more at a time. Mainly because the stats can be fairly skewed because of the fast increase in blinds(person might only be playing 12% of hands the first two levels til he doubles up, but then moves to like 55% when it gets shorthanded). I'm not saying it doesn't help at all, but just not as much as it does for say cash games.
SnGIcons and SitNGoGrinders are good training video sites that you can look into(also many of the big sites have some SnG vids on them as well).
Collin Moshman has a book, Sit'N'Go Strategy that is very good and I would recommend to any serious SnG player. Ask dakota, she is part of Team Moshman .
Learn ICM(Independent Chip Modeling) and it will help you with your push/fold strategy and when to apply it.
Other than that, your brain like jazz said.