Byrdseed, a site I just learned about today, contains ideas to use in gifted classrooms. I've already found some great ideas to use with any class.
On the site is something called the Differentiator. The differentiator makes it easy to come up with lesson objectives following Bloom's taxonomy and other guidelines.
You pick a thinking skill, such as explain, describe, or criticize, then pick the content it is about, the resources students will use, and the product that they will create and the site creates a one sentence objective. It is very easy to use and will help you plan out lessons and make sure you are doing different things in your lessons for different types of learners and different levels of understanding. An example of one I did is below.