Deep learning

I just find that this research topic is quite new.
I intend to get deeper into it, especially its impact in NLP research.

Some of review paper or tutorials:

1) http://deeplearning.net/
(tutorial: http://deeplearning.net/tutorial/)

2) ACL 2012 tutorial:
http://www.socher.org/index.php/DeepLearningTutorial/DeepLearningTutorial

3) Ronan Collobert (http://ronan.collobert.com/)
http://ronan.collobert.com/pub/matos/2008_nlp_icml.pdf
http://ronan.collobert.com/pub/matos/2009_tutorial_nips.pdf
http://ronan.collobert.com/pub/matos/2011_nlp_jmlr.pdf

4) ...