TellMeText intercepts incoming SMS (text) messages to your Windows Mobile device and reads them out to you before they go to your inbox. This can be really useful in situations where you have your phone but can’t or don’t want to physically touch it to read incoming messages. (For example, if you’re driving a car or eating your lunch).  
TellMeText can run in the background so it doesn’t interfere with your normal use of the device.
The TextToSpeech functionality is provided by software from the Flite project.
TellMeText requires priviliged access to your device in order to intercept the SMS messages. For this reason, we strongly recommend that you download and install BlondieSoft’s Windows Mobile Certificates first.
(from: shaphpar / forum /xda-developer ..)

http://www.blondiesoft.com/software/mobile/TellMeText/