The United States Patent and Trademark Office ("USPTO") has an electronic database of trademark applications and registrations that you can search through for free. It's not as ideal as conducting a comprehensive trademark search since it does not include other databases like state trademark registration databases, but it is better than not doing any search at all.
Books and Practice Guides
NOLO - TRADEMARK
NOLO - TRADEMARK: Legal Care for Your Business and Product Names
The Nolo books can be a good starting point to get a basic working understanding of a subject area. This book on trademarks is worth reading to learn some of the basics if you are new to trademarks and trademark law.
This is the trademark bible. It covers just about everything relating to trademarks. However, it is extremely expensive. So, unless you are a multi-person law firm specializing in trademark law, you may want to simply read it at your local law library (my local law library even allows you to check it out).
Oppositions and Cancellations
Accounting and Invoicing
Freshbooks is a cloud accounting system. But it's real strength is how easy it makes billing your time and invoicing your clients. You can even use it to collect payment through credit cards without setting up a separate merchant account. Freshbooks also offers a free 30 day trial.
Calendaring and Docketing
Networking and Business Development
iPHONE VIDEO HERO
iPHONE VIDEO HERO
This video course was put together by Jules Watkins, a TV director and producer. The course is very reasonably priced (less than $100) and shows you how to shoot great video on your iPhone, including videos for blogs, membership sites, and video-based courses. Jules even shows you how to get the Apple white background for your videos if that's your thing.