There is so much medical and health information floating around these days which can be a great help or a big hurt.
Always remember that when you are browsing any website with health or medical information, it is important to keep your accuracy and reliability goggles on (check the source of the information, the credibility of the writer, cross reference with other publications on the same topic, etc).
WebMD is a huge and widely accepted source of medical information, but it is good practice to really check out the information that can potentially help or harm you. That being said, the website offers a few really great tools for people with diabetes.