On: All Packt ebooks are $5

[jackgolding]

There are some real gems in here for data guys at least - here is two to recommend:

Building Machine Learning Systems with Python

Data Visualization: a successful design process

Disclaimer: They gave me a book for free to write an article on once, other than that I am not affiliated.

EDIT: I see many posts about the quality of books published by Packt, the data vis book I recommended is written by an leader in the field of it (Andy Kirk.)

[moondowner → jackgolding]

Another gem I'd like to point out is the book "Infinispan Data Grid Platform". It was my first purchase at Packt, thorough and well written.