Captures at regular intervals of time the desktop/active window, along with his text
CropperPlugins - http://www.codeplex.com/cropperplugins
Cropper - http://www.codeplex.com/cropper
It's developed in C#
to install either download the dll, either compile source code
To make it work
Also , you can edit options for this plugin
Do not forget to press Print Screen Key in order to start capture!