Something that we always evaluate is organization. Systems and Organization are keys to running a successful business.
IMHO to be organized is to keep things simple. I love USEFUL software. One of my favorite pieces of software is Backpack.
What is backpack?
Backpack is a web-based service that makes organizing your information incredibly easy. Backpack lets you make pages which can contain any combination of notes, to-dos, images, files, etc. You can keep these pages to yourself or share them with colleagues, co-workers, friends, or family.
I use backpack as a mini-project management tool. I have a few template pages that are a series of note sections and to-do lists. We duplicate these pages and rename them for every project (ie shoot/wedding) we work on. It is a breeze to use and keeps us incredibly organized. We can see where we are in each project. When the project wraps, we simply email a copy of the page and then remove it from the list.
If you are looking to try something new for organization, give backpack a try! They offer a free version that allows you to create 5 pages. If you only have a few jobs at a time, this will be perfect for you.