The following are links to a variety of sites that provide useful resources for Product Marketing and Product Management professionals:

Pragmatic Marketing provides a course called “Practical Product Management” which is a “must” for every high tech Product Manager.
Autodemo makes powerful yet affordable flash-based software demos that can be viewed on your web site or from Sales’ laptops. Great solution for on-line demo rooms and trade shows.
Runaware is the world's leading Evaluation Service Provider (ESP), offering software publishers a revolutionary means of providing hassle-free software evaluations and demonstrations online, with no download or installation required.
WebSurveyor provides industry-leading online survey software and hosting service enabling organizations to conduct surveys by leveraging the power of the Internet. WebSurveyor is both powerful and incredibly easy to use.
The U.S. Patent & Trademark Office provides a useful search engine called “TESS” (Trademark Electronic Search System) for determining whether a potential product or feature name is already taken as a registered trademark.
Since its founding in 1998, the AIPMM has grown to become an invaluable resource for Product Marketing and Product Management professionals with information, news, training, placement assistance, and research data.
Founded in 2000, MarketingProfs.com specializes in providing both strategic and tactical marketing know-how to marketing professionals through a combination of provocative articles and commentary.
Countdown Project Management from Paradigm Learning is simply the best Project Management “crash course” around. This full-day course teaches the essentials of Project Management through a fun board game. This course is anything but boring!
Workplace Insights offers a unique, 20-minute assessment (for only $26.95) designed to provide deep insights into what makes you and your co-workers tick. Are you a “lion, otter, golden retriever or a beaver” in the workplace?
Founded in 1999, Greenough Communications ranks among the country's top 40 independent PR firms and was voted “2002 Small Agency of the Year” by industry authority, The Holmes Group. If you’re looking for a top notch PR firm, Greenough Communications is an excellent choice.
Founded in 1992, Vocus is the leading provider of Web-based software for public relations automation (PRA). If you’re looking for a way to track your PR activities, whether you’re working with a PR firm or not, you should definitely check out Vocus.
The Museum of Stupid High Tech Marketing is a fun place to visit when you want to feel a little better about yourself. Check out the Hall of Stupid Collateral and the Hall of Bad Positioning & Writing, just to name a few.