I currently am teaching Math to gifted students in grades 1st through 5th. Finding enrichment and extension activities that are worth while has been my greatest challenge this year. I have had to create a lot of what I do from scratch and will post to my Teacher's Pay Teachers store when they are store ready. In the mean time, here are the resources that I love most.
Byrd Seed - I saw him present at a gifted conference. If ever you get the chance to see him speak or better- if you live in the Irvine, CA area and can some how observe him teach... jump on the chance. His strategies are highly engaging to all students- and specifically aim to please the gifted learner.