I don't have any cool flash animations or anything, but I have a ton of geeky jokes that my fellow dorky science & engineering friends and I tell to each other.
-Two hydrogen atoms are walking down the street. Suddenly one turns to the other and says "Dude, I think I just lost an electron!" The other looks at him and says "Man, are you sure?" The first says "I'm positive!"
-A neutron walks into the bar and orders a scotch. He asks the bartender for his tab at the end of the night and the bartender says to him "For you, no charge."
-How can you tell the sex of a chromosome? Pull down it's genes! (That's one of mine... le sigh, no one appreciates the geneticist's humor)
-A piece of Na fell in love with a bunsen burner. "Oh Bunsie, I love you so much, I just melt when I see you," it exlaimed. The Bunsen burner told the poor Na "Don't worry, it's just a phase you're going through."