Machine Learning is a fast moving field, and many papers are incremental improvements, so an always up-to-date list will be unlikely. None the less, there are quite a few lists out there if you look. Here are some I've seen posted recently:

https://news.ycombinator.com/item?id=8728112

http://deeplearning.stanford.edu/wiki/index.php/UFLDL_Recomm...

http://www.cs.toronto.edu/~hinton/deeprefs.html

http://arxiv.org/abs/1404.7828