Evi is Siri for anyone with an earlier iPhone than the 4S, or Android users (yes, a dual platform app!)
It's 99 cents in the App Store. I'm going to get it later this week, I spent too much $ on apps last week, I feel the need to wait a full week before I buy more. I already have this and a new browser (that runs flash) on the list to get for my iPad. Anyhow, here's a good article discussing the features of Evi.