As the (wo)man, the myth, the legend continues to grow and your capabilities, accomplishments and skills become known to a wider audience you will often begin receiving invitations to join projects and tasks outside your current core responsibilities. These are great opportunities to learn new things, meet new people and help others with what you know so please take advantage of them.
However, while I strongly advise all to explore new opportunities, make sure that they are indeed what they are presented as. What I mean by this is, make sure that your knowledge and experience is needed and valued and that you are not simply being asked to be a passenger on a ride with predetermined specifications and destination.
After all, you are not a puppet.