Microsoft has just released a preview version of their cool new Windows Mobile application, Recite. What is it? It's a voice notes application with a useful twist: you can search your voice notes using speech. Have a hundred voice notes and don't want to listen through all of them? You don't have to-- just speak the word or phrase you're looking for and Recite will find it.
The application runs on Windows Mobile 6.0 and 6.1 phones, both Pro (touch screen models) and Standard Edition. It's language independent and does not do speech recognition, rather it matches sound when searching. Here's a video review showing it in action: