novembersnow is doing this one now, so that means it's cool again! I've actually been writing fic lately, so I have stuff that I can commentate upon, if anyone so desires.
If you've ever watched your favorite DVDs, and then found yourself eager to hear exactly what the actors, directors, writers and even production designers thought about making the episode, the movie, or whatever - you'll know sometimes the best parts of DVDs are hearing the commentaries. Getting into an actor's feelings about the character they play, getting the background behind a writer's plans and metaphors, even just getting the stupid anecdotal stuff that makes you laugh, it's all good.
Ask me about any story, and I'll do a DVD commentary for it! Satisfy your curiosity!