When a need arises, develop a criteria for what is being sought and adhere to it. This avoids being swayed by sites that are interesting, yet not productive in meeting the need. Save some down time and also explore these sites when there is not a specific need. Take notes to be developed later. This can encourage ownership of ideas and plans.
Teaching tends to be most exciting and effective when ownership occurs.
Remember, if something attempted in the classroom does not work, it does not mean it will not work. It may simply mean that it did not work in that situation. Regroup and analyze. Ask others to analyze. Often the smallest adjustment makes the difference between a failure and success.