Yeah, not your fault. TechCrunch jumped the gun on this story. There was a blip when they updated the servers, but Siri has been working fine since then. However, it is true that if you did not get Siri BEFORE today's announcement, you have to wait for the 4S, because they have pulled Siri from the App Store, which makes sense.

Here's the update that TechCrunch posted recently:

Update: After a brief downtime, the servers came back up.. with a message of their impending demise: “I’ve been replaced! The new Siri is even smarter and better looking than me, and waiting for you on the iPhone 4S. I’ll be leaving for home Oct 15th. Until then…how can I help you?”