We mentioned NotNow Beta last week, and Daniel over at ToySoft just let me know that they have released the first version of this great application. If you hadn’t read the Beta post, NotNow is an application that allows you to ignore calls and automatically send an sms message explaining why you didn’t answer.
From the Description
There are times that you can not answer the call such as in a meeting, at the movie, driving or just busy. You can simply press the Ignore button and then select a pre-defined message to send to the caller.
Note: You can optionally set NotNow to send to only people in your Contacts that have a mobile number. Landline callers may not be able to receive SMS and some carriers charges you for sending SMS to landline numbers. Check with your wireless carrier.