Siri’s a smart little moppet, but she can’t do everything for you. You can’t ask her to find you a picture of a dog from Google Images, or see if the guy you have a blind date with that night is a registered sex offender, or really do anything that Siri and Wolfram Alpha aren’t already programmed to do.
The good news is that Siri hacker chpwn has teamed up with GitHub hacker Aman Gupta to figure out how to add custom Siri commands. The bad news is it’s quite complicated, and there’s no way to do it right now for yourself.
The example Gupta used on Twitter was showing Siri recognizing and responding to a custom command, “Hubot image me iPhone.” It seems to be working for him well enough, but don’t expect to be running custom Siri commands anytime soon: not only will it require a jailbreak of your iPhone 4S, which is far off, but the method the hackers are using is by no means ready for mass distribution.