Cross fade YouTube videos and create playlists. ‘nuff said.
Bored? How about turning any webpage into an awesome time-killing totally nostalgic asteroids game. In seconds. Thought so. Try it on my site, here. Just click this: Kick Ass!
Rad, right? Want to blow up any webpage? Drag those same words to your toolbar. Head to your favorite site. Hit the button. Bam. Yer Welcome.
(thanks @neonarcade for the tip on Kick Ass.)