Provides several binary related exercises for the famous free online education organization the http://KhanAcademy.org.

Students are challenged with generated binary to decimals and decimals to binary puzzles. The students must reach a maximum streak goal in order to complete the exercise and become proficient in it, so he or she may move on to the next exercise.

On top of that there's another exercise which involves solving binary with the binary operators such as "OR", "XOR", "NOT", "AND", "LSH" and "RSH".$teaser

You can practice the binary exercises on the Khan Academy: sandcastle.
Binary to Decimal
Decimal to Binary

Thanks to Michal Pokorny for polishing these exercises(hints).