All these new services enabled by advancing technology are great, but companies really need to start being more upfront about what they're doing with your data.
I'm willing to give information to companies to let them make my life easier as long as I know the tradeoffs. I should be able to make the determination on the value of my data, but I can't do that if I don't fully understand exactly what I'm giving up.
Well the device itself isn't powerful enough to run the speech recognition so they have to send the data back to their servers to run it (Nuance I think?) before responding with what the user said so Siri can use it.
It's certainly possible that Apple store every sound bite sent to those servers which is rather worrying. There needs to be some clarification on what they actually do with that data...