Differentiated Learning . . .

Differentiated Instruction or Differentiated Learning seems to be a catch phrase in education today. Meeting the needs of all learners. I am attempting this in my classroom, but in baby steps. I have 'differentiated' in how students are allowed to display their learning in Math - one student created a Youtube video, some used Jing and word processing, others made a video and others used kidpix. But as I continue on in this process I am wondering if I am truly differentiating. Is giving students a choice in how they demonstrate their learning differentiation?