As I'm sure a lot of people already know...you can use unsweetened apple sauce as an oil and sugar substitution in a lot of recipes. I've also started using Agave Nectar as a sugar substitute. You just have to adjust time and temp when using Agave.
Anytime a baking recipe calls for eggs I use egg beaters. I also use apple sauce instead of oil for my cakes and sometimes in place of part of the butter. I then bring it to work (before I have any). This way I get the little bit I want but don't have it sitting around the house to tempt me later...