If you're interested in theano primarily because of deep learning, I highly recommend you check out pylearn2 (not too much documentation, but docs here: http://deeplearning.net/software/pylearn2/ and source on github here: github.com/lisa-lab/pylearn2 ).

Pylearn2 is a set of deep learning algorithms implemented with theano. The LISA (deep learning) group at the University of Montreal (same group that created theano) maintains this library and puts a lot of the code they use for their papers in pylearn2. pylearn2 thus makes it quite easy to use a lot of state of the art algorithms, such as maxout.