Well, I've never been that big on Nerf. When me and my siblings were kids my mother didn't want us playing with guns, even though they shoot darts so soft that the term to "nerf" something means to remove its potency for causing damage, Nerf guns were not really allowed in the house.
Anyway, apparently there's a large online community of Nerf enthusiasts, and there's youtube. Here's some videos of the sort of thing a Nerf enthusiast would be into:
Making a Nerf gun more powerful (seems like defeating the purpose of a Nerf gun, but that's fine I guess):
http://www.youtube.com/watch?v=vDeZMeg5L5E&feature=fvw
A homemade Nerf Gun that apparently can shoot 210 feet (Although the claim seems dubious, and I recommend watching with the sound off):
http://www.youtube.com/watch?v=NcOmf8FuMSs&NR=1&feature=fvwp
An incredibly complex robotic Nerf Sentry gun:
http://www.youtube.com/watch?v=PGRBjCrnjhs
An RC Nerf tank (an overall funny video):
http://www.youtube.com/watch?v=5FjT9nUkj-I&NR=1
And that's about all the Nerf videos that don't feature 13 year old boys with screachy voices.
And that's about all until next time.
-The Thought Salesman