And here was me thinking I'd never want to own an iPhone

From an article at EW - Dr Horrible: An oral history

Fillion That is my friend PJ Haarsma. I called him up and I said ''Can you make me a thing? That looks like a thing?'' Twenty minutes later he says, ''Check out this website. You can call it up on your iPhone and you have a Dr. Horrible van remote.'' At Comic-Con, I'm going to release the Website that has the Dr. Horrible van remote.

It's a lovely article full of fun stuff from Joss, Felicia, Nathan, Neil, Jed and Maurissa, go read the lot.

ETA: Dr Horrible van remote site (linked by highandrandom on Whedonesque)