WEKA Manual: http://prdownloads.sourceforge.net/weka/WekaManual-3-7-10.pdf

You can find useful material here:

An useful introductory video on Weka

http://www.youtube.com/watch?v=m7kpIBGEdkI

The complete documentation and various tutorials

http://www.cs.waikato.ac.nz/ml/weka/documentation.html

Finally Weka and GIS:

Extending the WEKA Data Mining Toolkit to support Geographic Data Preprocessing

http://www.inf.ufsc.br/~vania/artigos/Weka2006.pdf

Machine Learning Algorithms for GeoSpatial Data. Applications and Software Tools

http://www.iemss.org/iemss2008/uploads/Main/S04-09-Kanevski_et_al-IEMSS2008.pdf

I hope you can find this material useful,

Kind Regards

Thank you all ... :) this is really helpful :)

Check the following two online courses:

https://weka.waikato.ac.nz/explorer

1. "Data Mining with Weka"

"The 5-week course starts on 3rd March 2014."

2. "More Data Mining with Weka"

"The 5-week course will begin in late April 2014, with enrolments opening in early March."

Source:

http://www.cs.waikato.ac.nz/ml/weka/

"Data Mining with Weka is a 5 week MOOC, which was held first in late 2013. Check out the MOOC site for video lectures and details on how to enrol into this course and a new, advanced Weka course."

Thanks Mohammad, thank you Aria it is really very helpful :)