What Android app replicates the iPhone Siri (voice recognition) functionality? The new Siri app on the iPhone looks pretty intersting (at least from the videos).  Is there an application on Android that matches or improves on the same functionality?  Specifically, something that doesn't require the memorization of robotic voice commands?

I have tried Vlingo, but for many requests it just seems to perform a Google search which leaves you in a web browser without voice functionality.
There's nothing (at present) that can do all that Siri does.

Depending on your needs you might be able to get close.

Lifehacker had an article about your current alternatives: How to Get a Siri-Like Personal Assistant on Your Android Phone for Free

To summarize: You'll need one of the following (or a combination):


Google Voice Actions for Android
Vlingo
Edwin
SpeakToIt Assistant


Update: terryk2 points out Iris, currently in alpha testing, which is by the developers' own admission a direct response to Siri.